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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

For the quarterly period ended September 30, 2006

or

For the transition period from              to             .

Commission File Number: 0-19582

OLD DOMINION FREIGHT LINE, INC.

(Exact name of registrant as specified in its charter)

500 Old Dominion Way

Thomasville, NC 27360

(Address of principal executive offices)

(Zip Code)

(336) 889-5000

(Registrant’s telephone number, including area code)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  x    No  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, or a non-accelerated filer. See definition of “accelerated filer and large accelerated filer” in Rule 12b-2 of the Exchange Act. (Check one).

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ¨    No  x

As of November 7, 2006, there were 37,284,675 shares of the registrant’s Common Stock ($0.10 par value) outstanding.

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INDEX

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PART I. FINANCIAL INFORMATION

Item 1. Financial Statements

OLD DOMINION FREIGHT LINE, INC.

CONDENSED BALANCE SHEETS

Note: The Condensed Balance Sheet at December 31, 2005 has been derived from the audited financial statements at that date, but does not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements.

The accompanying notes are an integral part of these condensed financial statements.

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OLD DOMINION FREIGHT LINE, INC.

CONDENSED BALANCE SHEETS

(CONTINUED)

Note: The Condensed Balance Sheet at December 31, 2005 has been derived from the audited financial statements at that date, but does not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements.

The accompanying notes are an integral part of these condensed financial statements.

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OLD DOMINION FREIGHT LINE, INC.

CONDENSED STATEMENTS OF OPERATIONS

(Unaudited)

The accompanying notes are an integral part of these condensed financial statements.

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OLD DOMINION FREIGHT LINE, INC.

CONDENSED STATEMENTS OF CHANGES IN SHAREHOLDERS’ EQUITY

Note: The Condensed Statements of Changes in Shareholders’ Equity includes information derived from the audited financial statements as of December 31, 2005, but does not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements.

The accompanying notes are an integral part of these condensed financial statements.

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OLD DOMINION FREIGHT LINE, INC.

CONDENSED STATEMENTS OF CASH FLOWS

(Unaudited)

The accompanying notes are an integral part of these condensed financial statements.

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NOTES TO CONDENSED FINANCIAL STATEMENTS (Unaudited)

Note 1. Significant Accounting Policies

Basis of Presentation

The condensed financial statements were consolidated for all periods prior to June 30, 2005 and include the accounts of Old Dominion Freight Line, Inc. and its then-wholly owned and sole subsidiary. All significant intercompany balances and transactions were eliminated in consolidation. The subsidiary was dissolved on a voluntary basis by its Board of Directors without an income statement impact and its assets were transferred to the Company effective June 30, 2005.

The accompanying unaudited, interim condensed financial statements have been prepared in accordance with accounting principles generally accepted in the United States for interim financial information and, in management’s opinion, contain all adjustments (consisting of normal recurring items) necessary for a fair presentation, in all material respects, of the financial position and results of operations for the periods presented. Accordingly, they do not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements.

The preparation of condensed financial statements in accordance with accounting principles generally accepted in the United States requires management to make estimates and assumptions. Such estimates and assumptions affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the condensed financial statements and the reported amounts of revenue and expenses during the reporting period. Actual results could differ from those estimates. The results of operations for the interim period ended September 30, 2006 are not necessarily indicative of the results that may be expected for the year ending December 31, 2006.

The condensed financial statements should be read in conjunction with the financial statements and related footnotes, which appear in our Annual Report on Form 10-K for the year ended December 31, 2005. For comparability, certain reclassifications were made to conform prior-period condensed financial statements to the current presentation.

There have been no significant changes in the accounting principles and policies, long-term contracts or estimates inherent in the preparation of the condensed financial statements of Old Dominion Freight Line, Inc. or significant changes in our commitments and contingencies as previously described in our Annual Report on Form 10-K for the year ended December 31, 2005, other than the changes described in this quarterly report.

Unless the context requires otherwise, references in these Notes to “Old Dominion”, the “Company”, “we”, “us” and “our” refer to Old Dominion Freight Line, Inc.

Short-term Investments

Short-term investments consist of auction-rate securities and variable rate demand obligations, both of which are securities with an underlying component of a long-term debt instrument. Interest rates on auction-rate securities reset on a shorter term than the underlying instrument based on an auction bid process that resets the interest rate of the security. The auction or reset dates occur at intervals that are generally between 7 and 35 days of the purchase. Variable rate demand obligations have a coupon rate that is generally reset daily or weekly, and the Company has the option to put the security back to the trustee or tender agent at par on any business day with proceeds received either the same day or in 7 days, depending on the mode of reset. Short-term investments are classified as current assets due to these rate-setting mechanisms and the ability to liquidate.

Short-term investments are classified as available-for-sale and reported on the condensed balance sheets at fair value in accordance with Statement of Financial Accounting Standards (“SFAS”) No. 115, “Accounting for Certain Investments In Debt and Equity Securities.” The cost of securities sold is based on the specific identification method and unrealized gains and losses, if any, are reported net of tax in accumulated other comprehensive income. There were no unrealized gains or losses as of

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NOTES TO CONDENSED FINANCIAL STATEMENTS (Unaudited) (Continued)

September 30, 2006. Interest income related to these investments is included in “Interest income” on the condensed statements of operations. There were no short-term investments with these characteristics held in 2005.

Tires on Equipment

Prior to 2005, the cost of original and replacement tires mounted on equipment was reported as a current asset in tires on equipment, and amortized based on usage determined by periodic samplings of tread depth. In the fourth quarter of 2005, the Company changed its policy for accounting for tires and began capitalizing the cost of tires mounted on purchased revenue equipment as a part of the total depreciable cost of such equipment. Under the new policy, subsequent replacement tires are expensed at the time those tires are placed in service similar to other repairs and maintenance costs. We believe that this new method provides a more precise and less subjective method to account for tires on equipment due to our growth and geographic expansion and is consistent with industry practice. The cumulative effect of the change as of January 1, 2005 was a $408,000 decrease to net income (net of tax benefit of $272,000) or $0.01 and $0.02 per diluted share for the year-to-date periods ended September 30, 2005 and December 31, 2005, respectively.

Common Stock Split

On October 31, 2005, the Board of Directors approved a three-for-two common stock split for shareholders of record as of the close of business on November 16, 2005. On November 30, 2005, those shareholders received one additional share of common stock for every two shares owned. All references in this report to shares outstanding, weighted average shares outstanding and earnings per share amounts have been restated retroactively for this stock split.

Earnings Per Share

Earnings per common share is computed using the weighted average number of common shares outstanding during each period. There were no remaining exercisable employee stock options at September 30, 2006 and the dilutive effect of the options was immaterial to the calculation of diluted earnings per share for the interim periods ended September 30, 2005.

Share-Based Compensation

Effective January 1, 2006, Old Dominion adopted SFAS No. 123(R), Share-Based Payment. This Statement, which is a revision of SFAS No. 123, Accounting for Stock-Based Compensation, supersedes APB Opinion No. 25, Accounting for Stock Issued to Employees, and amends SFAS No. 95, Statement of Cash Flows. Generally the approach in SFAS No. 123(R) is similar to the approach described in SFAS No. 123. However, SFAS No. 123(R) requires all share-based payments to employees, including grants of employee stock options, to be recognized in the income statement based on their fair values. Pro forma disclosure is no longer an alternative.

On May 16, 2005, our Board of Directors approved and the Company adopted the Old Dominion Freight Line, Inc. Phantom Stock Plan (the “Phantom Stock Plan”). The maximum number of shares of phantom stock available for awards to eligible employees under the Phantom Stock Plan is 375,000, subject to any change in the outstanding shares of our common stock. Our Board of Directors approved the initial grant under this plan at its January 2006 meeting that resulted in aggregate awards of 26,845 phantom shares. Additional grants under this plan may be awarded annually hereafter, subject to the Company meeting certain operating measures to be determined by our Board of Directors. Shares awarded under the Phantom Stock Plan are accounted for as a liability under SFAS No. 123(R), which totaled $271,000 at September 30, 2006. The disclosure requirements of SFAS No. 123(R) are not material to the Company and, therefore, are not presented.

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NOTES TO CONDENSED FINANCIAL STATEMENTS (Unaudited) (Continued)

Recent Accounting Pronouncements

In July 2006, the Financial Accounting Standards Board (“FASB”) issued FASB Interpretation No. 48, Accounting for Uncertainty in Income Taxes (“FIN 48”), which clarifies the accounting for uncertainty in income tax positions in accordance with SFAS No. 109, Accounting for Income Taxes. FIN 48 defines the threshold for recognizing the benefits of a tax position that is more likely than not to be sustained upon examination based on the technical merits of the position. FIN 48 then prescribes a method for measuring the tax benefit for those tax positions requiring recognition in the financial statements. FIN 48 also provides guidance on derecognition, classification, interest and penalties, accounting in interim periods, disclosure and transition. FIN 48 will be effective January 1, 2007 and the Company is currently evaluating the impact of adopting FIN 48 on its financial statements.

In September 2006, the FASB issued SFAS No. 157, Fair Value Measurements, which provides enhanced guidance for using fair value to measure assets and liabilities. This standard expands information about the extent to which the Company measures assets and liabilities at fair value, the information used to measure fair value and the effect of fair value measurements on earnings. It does not expand on the use of fair value in any new circumstances. SFAS No. 157 applies whenever other standards require (or permit) assets or liabilities to be measured at fair value and is effective for fiscal years beginning after November 15, 2007, and interim periods within those fiscal years. Early adoption is permitted. We do not expect the adoption of SFAS No. 157 to have a material impact on our financial position, results of operations or cash flows.

In September 2006, the SEC issued Staff Accounting Bulletin No. 108 (“SAB 108”), which provides interpretive guidance on how the effects of prior-year uncorrected errors must be considered in quantifying misstatements in the current year financial statements. The SEC staff believes that registrants must quantify errors using both a balance sheet and an income statement approach and evaluate whether either approach results in quantifying a misstatement that, when all relevant quantitative and qualitative factors are considered, is material. SAB 108 is effective for fiscal years ending after November 15, 2006 and provides special transition provisions for certain circumstances. We do not expect the adoption of SAB 108 to have a material impact on our financial position, results of operations or cash flows.

Note 2. Long-term Debt

Long-term debt consisted of the following:

We entered into a five-year, $225,000,000 senior unsecured revolving credit facility pursuant to the terms of an amended and restated credit agreement (the “Credit Agreement”), dated August 10, 2006, with Wachovia Bank, National Association serving as administrative agent for the lenders. This Credit Agreement amended and restated the terms of the existing $110,000,000 senior unsecured revolving credit facility dated September 22, 2005, as amended. Of the $225,000,000 line of credit commitments, $150,000,000 may be used for letters of credit and $15,000,000 may be used for borrowings under Wachovia’s sweep program. The sweep program is a daily cash management tool that automatically initiates borrowings to cover overnight cash requirements up to an aggregate of $15,000,000 or initiates

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NOTES TO CONDENSED FINANCIAL STATEMENTS (Unaudited) (Continued)

overnight investments for excess cash balances. In addition, we have the right to request an increase in the line of credit commitments up to a total of $300,000,000 in minimum increments of $25,000,000. At our option, revolving loans under the facility bear interest at either: (a) the higher of Wachovia Bank’s prime rate or the federal funds rate plus 0.5% per annum (the “Base Rate”); (b) LIBOR (one, two, three or six months) plus an applicable margin (the “Adjusted LIBOR Rate”); or (c) one-month LIBOR plus an applicable margin (the “LIBOR Index Rate”). The applicable margin is determined by a pricing grid in the Credit Agreement and ranges from 0.5% to 1.125%. The applicable margin was 0.625% for the period this Credit Agreement was in effect during the third quarter of 2006. Revolving loans under the sweep program bear interest at the LIBOR Index Rate.

The Credit Agreement contains customary covenants, including financial covenants that require us to observe a maximum ratio of debt to total capital and a minimum fixed charge coverage ratio. Any future wholly owned subsidiaries of the Company would be required to guarantee payment of all of our obligations under the facility. At September 30, 2006, there was no outstanding balance on the line of credit facility and there was $48,657,000 of outstanding letters of credit.

Commitment fees ranging from 0.1% to 0.225% are charged quarterly in arrears on the aggregate unutilized portion of the Credit Agreement. Letter of credit fees equal to the applicable margin for Adjusted LIBOR Rate loans are charged quarterly in arrears on the daily average aggregate stated amount of all letters of credit outstanding during the quarter. The commitment fees and letter of credit fees were 0.125% and 0.625%, respectively, for the period the Credit Agreement was in effect during the third quarter of 2006. In addition, a facing fee at an annual rate of 0.125% is charged quarterly in arrears on the daily average aggregate stated amount of all letters of credit outstanding during such quarter.

On April 25, 2006, we issued $100,000,000 of privately-placed Series A Senior Notes, Tranche A and on June 15, 2006 issued an additional $75,000,000 of privately-placed Series A Senior Notes, Tranche B (collectively, the “Series A Notes”) pursuant to the terms of a Note Purchase Agreement. The Series A Notes bear an annual interest rate of 5.85% from the date of issuance and mature on April 25, 2016. The Series A Notes call for semi-annual interest payments beginning on October 25, 2006 and seven equal annual principal prepayments commencing on April 25, 2010. The proceeds from this agreement were used to refinance existing indebtedness under our revolving credit agreement and the Company expects to use the remaining proceeds for planned capital expenditures and for general corporate purposes. The Note Purchase Agreement may also serve as the platform for potential future private note issuances by the Company. The aggregate principal amount of all notes issued pursuant to the Note Purchase Agreement, including the Series A Notes, shall not exceed $500,000,000. The applicable interest rate and payment schedules for any new notes will be determined and mutually agreed upon at the time of issuance.

Note 3. Commitments and Contingencies

We are involved in various legal proceedings and claims that have arisen in the ordinary course of our business that have not been fully adjudicated. Many of these are covered in whole or in part by insurance. Our management does not believe that these actions, when finally concluded, will have a significant adverse effect upon our financial position or results of operations.

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Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

Unless the context requires otherwise, references in this report to “Old Dominion”, the “Company”, “we”, “us” and “our” refer to Old Dominion Freight Line, Inc.

Overview

We are a leading non-union less-than-truckload (“LTL”) multi-regional motor carrier providing timely one-to-five day service among five regions in the United States and next-day and second-day service within these regions. Through our four branded product groups, OD-Domestic, OD-Expedited, OD-Global and OD-Technology, we offer an expanding array of innovative products and services. At September 30, 2006, we provided full-state coverage to 37 of the 47 states that we served directly within the Southeast, South Central, Northeast, Midwest and West regions of the country. Through marketing and carrier relationships, we also provide service to and from the remaining states as well as international services around the globe.

As opportunities arise, we plan to expand geographically to complete our national footprint and add additional service centers in existing states so that we can offer expanded full-state coverage and ensure that our service center network has sufficient capacity. We opened service centers during the third quarter of 2006 in Seaford, Delaware; Pompano Beach, Florida; and Shreveport, Louisiana. We are scheduled to open four additional service centers in the fourth quarter of 2006, and have already opened two of these service centers in Rockford, Illinois and Saginaw, Michigan.

Our revenue is derived from transporting shipments and providing logistical services to our customers, whose demand for our services is generally tied to the overall health of the U.S. domestic economy. We compete with regional, inter-regional and national LTL carriers and, to a lesser extent, other transportation companies. We believe that we provide greater geographic coverage than most of our regional competitors and our transit times are generally faster than those of our principal national competitors. We believe that our diversified mix and scope of regional and inter-regional services – offered through one company – enable us to provide our customers with a single source to meet their LTL shipping needs and provides us with a distinct advantage over our regional, multi-regional and national competition.

In analyzing the components of our revenue, we monitor changes and trends in the following key metrics:

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Our primary revenue focus is to increase shipment and tonnage growth within our existing infrastructure, generally referred to as increasing density, thereby maximizing asset utilization and labor productivity. We measure density over many different functional areas of our operations including revenue per service center, linehaul load factor, pickup and delivery (“P&D”) stops per hour, P&D shipments per hour and platform pounds handled per hour. We believe continued improvement in density is a key component in our ability to sustain profitable growth.

Our primary cost elements are direct wages and benefits associated with the movement of freight; operating supplies and expenses; and depreciation of our equipment fleet and service center facilities. We gauge our overall success in managing these costs by monitoring our operating ratio, a measure of profitability calculated by dividing total operating expenses by revenue, which also allows industry-wide comparisons with our competition.

We continually upgrade our technological capabilities to improve our customer service and lower our operating costs. This technology provides our customers with visibility of their shipments throughout our systems, while providing key metrics from which we can monitor our processes.

Market fluctuations in the cost of key components of our cost structure, such as diesel fuel, can affect our profitability. Our tariffs and contracts generally provide for a fuel surcharge as diesel fuel prices increase above stated levels.

We are also subject to market changes in insurance rates, and we continue to evaluate our balance of excess insurance coverage and self-insurance to minimize that cost. We are currently self-insured for bodily injury and property damage claims up to $2,750,000 per occurrence. This self-insured retention level was increased from $2,500,000 during the previous plan year ended March 30, 2006. Cargo loss and damage claims are self-insured up to $100,000. We are self-insured for workers’ compensation in certain states and have high deductible plans in the remaining states, both of which results in exposure up to $1,000,000 per occurrence. Group health claims are self-insured up to $300,000 per occurrence and long-term disability claims are self-insured to a maximum per individual of $3,000 per month.

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The following table sets forth, for the periods indicated, expenses and other items as a percentage of revenue from operations:

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Results of Operations

Key financial and operating metrics for the three and nine-month periods ended September 30, 2006 and 2005 are presented below:

Our financial and operating performance in the third quarter and first nine months of 2006 continues to demonstrate our ability to execute our long-term growth strategy of creating sustainable profitable growth. Our revenue growth in the third quarter of 22.7% represents our tenth consecutive quarter of growth in excess of 20% and was primarily attained within existing markets. The additional density in our existing markets generated operating leverage that resulted in a quarterly operating ratio of 89.1%, which extended the trend of comparable-quarter improvement in our operating ratio to 20 consecutive quarters. Revenue for the nine-month period ended September 30, 2006 increased 23.7% to $960,012,000 from $776,192,000 for the comparable period in 2005.

Revenue

Revenue growth for the third quarter and first nine months of 2006 was primarily due to a 15.3% increase in tonnage and a 5.1% increase in revenue per hundredweight during the third quarter of 2006 and respective increases of 17.3% and 5.1% for the first nine months of 2006. Our tonnage growth for the third quarter consists of an 11.5% increase in shipments and a 3.4% increase in weight per shipment. For the nine-month period, shipments increased 11.5% and weight per shipment increased 5.3% from the prior-year period. We attribute our revenue and tonnage growth primarily to increases in market share in our existing areas of operations. We believe that as we develop our national footprint with full-state coverage, we will continue to gain additional market share from our existing customers and new customers who seek consistent, high-quality regional and inter-regional service.

We opened 24 new service centers during the first nine months of 2006, thereby increasing our total network to 178 service centers. Three of these new service centers were added during the third quarter. Of the 21 service centers added in the first half of 2006, 13 were a result of the acquisition of selected assets of UW Freight Line, Inc. While the expansion of our service center network and improvement in our service capabilities should provide a platform for future growth, approximately 97% of our revenue for the third quarter of 2006 was produced in service centers over one year old.

Revenue per hundredweight increased to $13.41 from $12.76 in the third quarter of 2005 and increased to $13.17 from $12.53 in the first nine months of 2005. These pricing improvements occurred despite increases in weight per shipment in the third quarter and first nine months of 2006, which generally have the affect of reducing revenue per hundredweight. Increases in our revenue per hundredweight for the quarter and nine-month period are a reflection of our ability to maintain pricing discipline while increasing the volume of freight moving through our service center network, despite pricing pressures that developed during the third quarter of 2006. We have experienced slight declines in both weight per shipment and revenue per hundredweight since the end of the third quarter of 2006, which is consistent with market indicators of a slowing economy. If this trend continues through the

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remainder of the fourth quarter, our growth in revenue and net income could slow in comparison to the growth experienced in the first nine months of 2006. However, we believe that we can maintain operational efficiencies to continue our trend of comparable quarter improvement in our operating ratio even in a period of slower growth.

Our tariffs and contracts generally provide for a fuel surcharge as diesel fuel prices increase above stated levels, which is consistent with industry practice. This surcharge is recorded as additional revenue and was implemented to offset significant fluctuations in the price of diesel fuel, which is one of the larger components of our operating supplies and expenses. Because of the sustained increase in diesel fuel costs and other petroleum-based products, our freight pricing strategy, as well as that in the LTL industry, has evolved and the fuel surcharge is one of many components in the overall price for our transportation services. As a result, the fuel surcharge often represents more than just the pass through of increased diesel fuel cost. Because of average higher fuel prices for the first nine months of 2006, the fuel surcharge increased to 12.2% of revenue from 9.6% from the comparable nine-month period in 2005. Our fuel surcharge revenue more than offset our increased cost of diesel fuel, excluding fuel taxes, in the first nine months of 2006. A rapid and significant decrease in diesel fuel prices would likely reduce our revenue and operating income until we revised our pricing strategy.

Operating Costs and Other Expenses

Our operating ratio improved to 89.1% and 89.7% for the third quarter and first nine months of 2006, respectively, from 89.5% and 90.8% in the comparable prior-year periods. Much of the improvement for both periods is a result of our focus on increasing density throughout our operations, which leverages certain fixed costs and maximizes labor productivity. Increased density contributed to a 6.9% increase in our average revenue per service center for the nine-month period, despite the opening of 24 service centers, and an improvement in salaries, wages and benefits as a percent of revenue for the three and nine-month periods ended September 30, 2006.

Salaries, wages and benefits improved to 53.1% of revenue in the third quarter and first nine months of 2006 from 54.0% and 55.0% for the comparable prior-year periods. Driver wages increased to 21.6% of revenue for the third quarter of 2006 from 21.3% for the prior-year quarter and decreased to 21.5% of revenue for the first nine months of 2006 from 21.9% in the first nine months of 2005. The year-to-date improvement in driver wages as a percent of revenue is due primarily to improvements in our linehaul load averages resulting from the increased density during 2006. However, we experienced declines in our linehaul load averages and P&D shipments per hour in the third quarter of 2006. We experienced improvements in platform labor, which decreased to 7.2% of revenue for the third quarter and first nine months of 2006 from 7.5% and 7.6% for the comparable periods in the prior year. Platform pounds handled per hour increased 4.5% and 6.6% for the three and nine-month periods ended September 30, 2006, respectively, primarily as a result of increases in weight per shipment. Fringe benefit costs increased to 28.5% and 28.3% of payroll expense for the third quarter and first nine months of 2006, respectively, from 28.1% and 27.1% in the comparable prior-year periods. Increases in our fringe benefit costs are primarily due to enhancements to our vacation policy for our full-time employees taking effect in 2006.

Operating supplies and expenses increased to 16.7% of revenue for the third quarter of 2006 from 15.2% for the prior-year quarter and increased to 16.1% of revenue from 14.5% in the first nine months of 2005. These increases are primarily due to a 40.9% and 48.5% increase in diesel fuel costs, excluding fuel taxes, for the third quarter and first nine months of 2006, respectively, resulting from both increased fuel prices and a 22.0% and 17.9% increase in consumption from the comparable prior-year periods. We currently do not use diesel fuel hedging instruments; therefore, we are subject to market price fluctuations. Our fuel surcharges, which are generally indexed to the U.S. Department of Energy’s published fuel prices, more than offset the increases in diesel fuel prices, excluding fuel taxes, in the third quarter and first nine months of 2006.

We purchase transportation services from other motor carriers and railroads for linehaul and P&D services. We also contract with lease operators for our container operations and incur short-term rentals for tractors, trailers and other revenue producing equipment. We primarily utilize these services when there are capacity restraints or imbalances of freight flow within our service center network or when it is

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economically beneficial. Purchased transportation increased to 3.4% of revenue in the third quarter of 2006 from 3.1% in the prior-year quarter and increased to 3.6% of revenue in the first nine months of 2006 from 3.3% in the same period of the prior year. The increases are primarily due to the increased use of purchased linehaul services beginning in the second quarter of 2006, which became necessary in certain lanes because of our significant growth. We were able to add a sufficient number of drivers in the third quarter of 2006, which allowed us to utilize our own equipment and decrease the use of purchased linehaul services. As a result, purchased linehaul services returned to historical levels in September 2006.

Interest expense, net of interest income, was $3,067,000 and $7,095,000 for the three and nine-month periods ended September 30, 2006, respectively, an increase of $1,300,000 and $2,190,000 from the comparable prior-year periods. The increase from the prior-year periods is primarily due to an increased average balance of our long-term debt resulting from the two separate issuances of privately-placed senior notes under the Note Purchase Agreement entered into on April 25, 2006, offset by the interest income earned on cash equivalents and short-term investments.

Our effective tax rate was 39.5% and 39.8% for the third quarter and first nine months of 2006 compared to 40.3% for the comparable periods of the prior year. We reduced the annual effective tax rate from 40.0% to 39.8% during the third quarter as a result of increased tax-exempt interest income earned on the Company’s short-term investments. The effective tax rate exceeded the federal statutory rate of 35% primarily due to the impact of state taxes and, to a lesser extent, certain non-deductible items.

Liquidity and Capital Resources

We have three primary sources of available liquidity to fund our estimated capital expenditures: cash flows from operations, short-term investments and available borrowings under the senior unsecured revolving credit agreement dated August 10, 2006. Expansion in both the size and number of service center facilities, our planned tractor and trailer replacement cycle and revenue growth have required continued investment in real estate and equipment. In order to support these requirements, we incurred net capital expenditures of $177,448,000, including the capital assets obtained as part of the acquisition of business assets, in the first nine months of 2006. Cash flows from operations funded approximately 67% of these expenditures. At September 30, 2006, long-term debt, including current maturities, increased to $274,883,000 from $128,956,000 at December 31, 2005, primarily due to the proceeds received from the privately-placed senior notes issued under the Note Purchase Agreement entered into on April 25, 2006. We entered into this Note Purchase Agreement to refinance existing indebtedness and for general corporate purposes, including, but not limited to, our estimated net capital expenditures not funded by operating cash flows. The remaining net proceeds from this transaction are included in “Short-term investments”.

We estimate capital expenditures, net of approximately $12,000,000 of anticipated proceeds from dispositions, to be approximately $210,000,000 to $215,000,000 for the year ending December 31, 2006. Of our gross capital expenditures, approximately $110,000,000 is allocated for the purchase of tractors and trailers; $90,000,000 is allocated for the purchase of service center facilities, construction of new service center facilities or expansion of existing service center facilities; and the remainder is allocated for investments in technology and other assets. The increase in our estimated capital expenditures for 2006 compared to 2005 is primarily due to planned real estate acquisitions and improvements to increase capacity at our existing service centers, which we believe is necessary in order for us to achieve our growth strategy. We plan to fund these capital expenditures primarily through cash flows from operations and the proceeds from the senior notes issued under the Note Purchase Agreement entered into on April 25, 2006.

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The table below sets forth our capital expenditures, including $11,421,000 of capital assets obtained as part of the acquisition of business assets, for the nine-month period ended September 30, 2006 and the years ended December 31, 2005, 2004 and 2003:

We entered into a five-year, $225,000,000 senior unsecured revolving credit facility pursuant to the terms of an amended and restated credit agreement (the “Credit Agreement”), dated August 10, 2006, with Wachovia Bank, National Association serving as administrative agent for the lenders. This Credit Agreement amended and restated the terms of the existing $110,000,000 senior unsecured revolving credit facility dated September 22, 2005, as amended. Of the $225,000,000 line of credit commitments, $150,000,000 may be used for letters of credit and $15,000,000 may be used for borrowings under Wachovia’s sweep program. The sweep program is a daily cash management tool that automatically initiates borrowings to cover overnight cash requirements up to an aggregate of $15,000,000 or initiates overnight investments for excess cash balances. In addition, we have the right to request an increase in the line of credit commitments up to a total of $300,000,000 in minimum increments of $25,000,000. At our option, revolving loans under the facility bear interest at either: (a) the higher of Wachovia Bank’s prime rate or the federal funds rate plus 0.5% per annum (the “Base Rate”); (b) LIBOR (one, two, three or six months) plus an applicable margin (the “Adjusted LIBOR Rate”); or (c) one-month LIBOR plus an applicable margin (the “LIBOR Index Rate”). The applicable margin is determined by a pricing grid in the Credit Agreement and ranges from 0.5% to 1.125%. The applicable margin was 0.625% for the period this Credit Agreement was in effect during the third quarter of 2006. Revolving loans under the sweep program bear interest at the LIBOR Index Rate.

The Credit Agreement contains customary covenants, including financial covenants that require us to observe a maximum ratio of debt to total capital and a minimum fixed charge coverage ratio. Any future wholly owned subsidiaries of the Company would be required to guarantee payment of all of our obligations under the facility. At September 30, 2006, there was no outstanding balance on the line of credit facility and there was $48,657,000 of outstanding letters of credit.

Commitment fees ranging from 0.1% to 0.225% are charged quarterly in arrears on the aggregate unutilized portion of the Credit Agreement. Letter of credit fees equal to the applicable margin for Adjusted LIBOR Rate loans are charged quarterly in arrears on the daily average aggregate stated amount of all letters of credit outstanding during the quarter. The commitment fees and letter of credit fees were 0.125% and 0.625%, respectively, for the period the Credit Agreement was in effect during the third quarter of 2006. In addition, a facing fee at an annual rate of 0.125% is charged quarterly in arrears on the daily average aggregate stated amount of all letters of credit outstanding during such quarter.

On April 25, 2006, we issued $100,000,000 of privately-placed Series A Senior Notes, Tranche A and on June 15, 2006 issued an additional $75,000,000 of privately-placed Series A Senior Notes, Tranche B (collectively, the “Series A Notes”) pursuant to the terms of a Note Purchase Agreement. The Series A Notes bear an annual interest rate of 5.85% from the date of issuance and mature on April 25, 2016. The Series A Notes call for semi-annual interest payments beginning on October 25, 2006 and seven equal annual principal prepayments commencing on April 25, 2010. The proceeds from this agreement were used to refinance existing indebtedness under our revolving credit agreement and the Company expects to use the remaining proceeds for planned capital expenditures and for general corporate purposes. The Note Purchase Agreement may also serve as the platform for potential future private note issuances by the Company. The aggregate principal amount of all notes issued pursuant to the Note Purchase Agreement, including the Series A Notes, shall not exceed $500,000,000. The applicable interest rate and payment schedules for any new notes will be determined and mutually agreed upon at the time of issuance.

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With the exception of borrowings pursuant to the Credit Agreement, interest rates are fixed on all of our debt instruments. Therefore, short-term exposure to fluctuations in interest rates is limited to our line of credit facility. We do not currently use interest rate derivative instruments to manage exposure to interest rate changes. Also, we do not use fuel hedging instruments, as our tariff provisions and contracts generally allow for fuel surcharges to be implemented in the event that fuel prices exceed stipulated levels.

Our senior notes and credit agreement limit the amount of dividends that may be paid to shareholders pursuant to certain financial ratios. Our Credit Agreement, which was the most restrictive at September 30, 2006, limits the amount of dividends that could be paid to shareholders to the greater of (i) $10,000,000, (ii) the amount of dividends paid in the immediately preceding fiscal year, or (iii) an amount equal to 25% of net income from the immediately preceding fiscal year. We did not declare or pay a dividend on our common stock in the third quarter of 2006, and we have no plans to declare or pay a dividend in 2006.

A significant decrease in demand for our services could limit our ability to generate cash flow and affect profitability. Most of our debt agreements have covenants that require stated levels of financial performance, which if not achieved could cause acceleration of the payment schedules. We do not anticipate a significant decline in business levels or financial performance, and we believe the combination of our existing Credit Agreement along with our additional borrowing capacity will be sufficient to meet seasonal and long-term capital needs.

Critical Accounting Policies

In preparing our condensed financial statements, we applied the same critical accounting policies as described in our Annual Report on Form 10-K for the year ended December 31, 2005 that affect judgments and estimates of amounts recorded for certain assets, liabilities, revenue and expenses.

Seasonality

Our tonnage levels and revenue mix are subject to seasonal trends common in the motor carrier industry. Financial results in the first quarter are normally lower due to reduced shipments during the winter months. Harsh winter weather can also adversely impact our performance by reducing demand and increasing operating expenses. Freight volumes typically build to a peak in the third quarter and early fourth quarter, which generally result in improved operating margins.

Environmental Regulation

We are subject to various federal, state and local environmental laws and regulations that focus on, among other things: the emission and discharge of hazardous materials into the environment or their presence on or in our properties and vehicles; fuel storage tanks; transportation of certain materials; and the discharge or retention of storm water. Under specific environmental laws, we could also be held responsible for any costs relating to contamination at our past or present facilities and at third-party waste disposal sites. We do not believe that the cost of future compliance with environmental laws or regulations will have a material adverse effect on our operations, financial condition, competitive position or capital expenditures for the remainder of 2006 or 2007.

Forward-Looking Information

Forward-looking statements in this report, including, without limitation, statements relating to future events or our future financial performance, appear in the preceding Management’s Discussion and Analysis of Financial Condition and Results of Operations and in other written and oral statements made by or on behalf of us, including, without limitation, statements relating to our goals, strategies, expectations, competitive environment, regulation and availability of resources. Such forward-looking statements are made pursuant to the safe harbor provisions of the Private Securities Litigation Reform

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Act of 1995. Investors are cautioned that such forward-looking statements involve risks and uncertainties that could cause actual events and results to be materially different from those expressed or implied herein, including, but not limited to, the following: (1) the competitive environment with respect to industry capacity and pricing; (2) the negative impact of any unionization of the Company’s employees; (3) the challenges associated with executing the Company’s growth strategy; (4) the Company’s compliance with legislation requiring companies to evaluate their internal control over financial operations and reporting; (5) various economic factors such as economic recessions and downturns in customers’ business cycles and shipping requirements; (6) the availability and cost of fuel; (7) difficulty in attracting or retaining qualified drivers; (8) the Company’s exposure to claims related to cargo loss and damage, property damage, personal injury, workers’ compensation, long-term disability and group health and the cost of insurance coverage above retention levels; (9) the Company’s significant ongoing cash requirements; (10) the availability and cost of new equipment; (11) the costs of compliance with, or liability for violation of, existing or future governmental regulation; (12) seasonal trends in the industry, including the possibility of harsh weather conditions; (13) the Company’s dependence on key employees; (14) changes in the Company’s goals and strategies, which are subject to change at any time at the discretion of the Company; and (15) other risks and uncertainties indicated from time to time in the Company’s filings with the Securities and Exchange Commission.

Item 3. Quantitative and Qualitative Disclosure of Market Risk

Market risk represents the risk of loss that may impact the consolidated financial position, results of operations and cash flows due to adverse changes in financial market prices and rates.

We are exposed to interest rate risk directly related to loans under our senior unsecured revolving credit agreements, which have variable interest rates. However, the Company has had no such loans under our senior unsecured revolving credit agreements subsequent to issuing $175,000,000 of Series A Senior Notes during the second quarter pursuant to the terms of a Note Purchase Agreement executed on April 25, 2006. We have established policies and procedures to manage exposure to market risks and use major institutions that are creditworthy to minimize credit risk.

We are exposed to market risk related to our short-term investments. However, we invest in high quality investment grade securities with interest reset periods generally between 1 to 35 days.

We are also exposed to commodity price risk related to diesel fuel prices and have established policies and procedures to manage our exposure to such risk.

For further discussion related to these risks, see “Management’s Discussion and Analysis of Financial Condition and Results of Operations – Operating Costs and Other Expenses” and – “Liquidity and Capital Resources” included in Item 2.

Item 4. Controls and Procedures

a) Evaluation of disclosure controls and procedures.

As of the end of the period covered by this report, our management has conducted an evaluation, with the participation of our Chief Executive Officer and Chief Financial Officer, of the effectiveness of our disclosure controls and procedures, in accordance with Rule 13a-15 under the Exchange Act. Based on this evaluation, our Chief Executive Officer and Chief Financial Officer concluded that our disclosure controls and procedures are effective to enable us to record, process, summarize and report in a timely manner the information that we are required to disclose in our Exchange Act reports.

b) Changes in internal control over financial reporting.

There were no changes in our internal control over financial reporting that occurred during our last fiscal quarter that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

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PART II. OTHER INFORMATION

Item 1A. Risk Factors

In addition to the other information set forth in this report, you should carefully consider the factors discussed in Part I, “Item 1A. Risk Factors” in our Annual Report on Form 10-K for the year ended December 31, 2005, which could materially affect our business, financial condition or future results. The risks described in our Annual Report on Form 10-K are not the only risks facing our Company. Additional risks and uncertainties not currently known to us or that we currently deem to be immaterial also may materially adversely affect our business, financial condition and/or operating results.

Item 6. Exhibits

Our SEC file number reference for documents filed with the SEC pursuant to the Securities Exchange Act of 1934, as amended, is 000-19582.

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

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EXHIBIT INDEX

TO QUARTERLY REPORT ON FORM 10-Q

Our SEC file number reference for documents filed with the SEC pursuant to the Securities Exchange Act of 1934, as amended, is 000-19582.

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