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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

For the quarterly period ended September 30, 2011

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 has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  x     No  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

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 8, 2011 there were 57,443,324 shares of the registrant’s Common Stock ($0.10 par value) outstanding.

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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, 2010 has been derived from the audited financial statements at that date, but does not include all of the information and footnotes required by U.S. generally accepted accounting principles 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, 2010 has been derived from the audited financial statements at that date, but does not include all of the information and footnotes required by U.S. generally accepted accounting principles 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 CASH FLOWS

(Unaudited)

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

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NOTES TO THE FINANCIAL STATEMENTS (UNAUDITED)

Note 1. Significant Accounting Policies

Basis of Presentation

The accompanying unaudited, interim condensed financial statements have been prepared in accordance with U.S. generally accepted accounting principles 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 U.S. generally accepted accounting principles for complete financial statements.

The preparation of condensed financial statements in accordance with U.S. generally accepted accounting principles 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, 2011 are not necessarily indicative of the results that may be expected for subsequent quarterly periods or the year ending December 31, 2011.

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, 2010. For comparability, certain reclassifications were made to conform prior-period 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. as previously described in our Annual Report on Form 10-K for the year ended December 31, 2010.

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.

Fair Values of Financial Instruments

At September 30, 2011 and December 31, 2010, the carrying values of financial instruments, such as cash and cash equivalents, customer and other receivables and trade payables, approximates their fair value due to the short maturities of these instruments. The cash surrender value relating to Company-owned life insurance contracts is included in “Other assets” on our Balance Sheets and totaled $25.3 million and $25.8 million at September 30, 2011 and December 31, 2010, respectively, which approximates fair value as determined by quoted market prices. The fair value of the senior notes included in our long-term debt was estimated to be $271.0 million and $212.3 million at September 30, 2011 and December 31, 2010, respectively. The fair value of these senior notes is based on undiscounted cash flows at market interest rates for similar issuances of private debt.

Earnings Per Share

Earnings per common share is computed using the weighted average number of common shares outstanding during the period.

Common Stock Split

On July 30, 2010, our Board of Directors approved a three-for-two common stock split for shareholders of record as of the close of business on August 9, 2010. On August 23, 2010, those shareholders received one additional share of common stock for every two shares owned. In lieu of

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NOTES TO THE FINANCIAL STATEMENTS (UNAUDITED) (CONTINUED)

fractional shares, shareholders received a cash payment based on the average of the high and low sales price of the common stock on the record date.

All references in this report to shares outstanding, weighted average shares outstanding and earnings per share amounts have been restated retroactively to reflect this stock split.

Recent Accounting Pronouncements

In September 2011, the Financial Accounting Standards Board (the “FASB”) issued Accounting Standards Update (“ASU”) 2011-08, Testing Goodwill for Impairment, which provides amendments to the existing two-step goodwill impairment test as described in Topic 350, Intangibles—Goodwill and Other. The amendments permit a first assessment of qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount as a basis for determining whether it is necessary to perform the two-step goodwill impairment test. The qualitative assessment is optional, allowing companies to go directly to the quantitative assessment. Although amendments of ASU 2011-08 are effective for annual and interim goodwill impairment tests performed for fiscal years beginning after December 15, 2011, early adoption is permitted. The Company does not expect the adoption of ASU 2011-08 to have a material impact on its financial position, results of operations or cash flows.

Note 2. Long-Term Debt

Long-term debt consisted of the following:

We have three outstanding unsecured senior note agreements with an aggregate amount outstanding of $262.9 million at September 30, 2011. These notes call for periodic principal payments with maturities that range from 2015 to 2021, of which $35.7 million is due in the next twelve months. Interest rates on these notes are fixed and range from 4.00% to 5.85%. The effective average interest rate on our outstanding senior note agreements was 5.13% and 5.54% at September 30, 2011 and December 31, 2010, respectively.

Included in our senior notes is $95.0 million related to a Note Purchase Agreement by and among the Company and the Purchasers, dated as of January 3, 2011. Under this agreement, we issued $50.0 million of privately-placed Senior Notes, Tranche A (the “Tranche A Notes”) and $45.0 million of privately-placed Senior Notes, Tranche B (the “Tranche B Notes” and, together with the Tranche A Notes, the “Notes”) on January 3, 2011. The Notes are unsecured and rank equally in right of repayment with the Company’s other senior unsecured indebtedness. The Tranche A Notes mature on January 3, 2018. The Company will pay interest on the unpaid balance of the Tranche A Notes at the rate of 4.00% per annum from the date of issuance. The Tranche B Notes mature on January 3, 2021. The Company will pay interest on the unpaid balance of the Tranche B Notes at the rate of 4.79% per annum from the date of issuance. The Company used a portion of the proceeds of the issuance of the Notes to refinance existing indebtedness, including paying down the outstanding balance on its senior unsecured revolving credit facility.

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NOTES TO THE FINANCIAL STATEMENTS (UNAUDITED) (CONTINUED)

We entered into a five-year, $200.0 million senior unsecured revolving credit facility pursuant to the terms of a second amended and restated credit agreement on August 10, 2011 (the “Credit Agreement”), with Wells Fargo Bank, National Association (“Wells Fargo”) serving as administrative agent for the lenders. This Credit Agreement amended and restated the terms of the existing $225.0 million senior unsecured revolving credit facility dated August 10, 2006. Of the $200.0 million line of credit commitments, $150.0 million may be used for letters of credit and $20.0 million may be used for borrowings under the Wells Fargo Sweep Plus Loan Program. This sweep program is a daily cash management tool that automatically initiates borrowings to cover overnight cash requirements up to an aggregate of $20.0 million 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 $300.0 million in minimum increments of $25.0 million. At our option, revolving loans under the facility bear interest at either: (a) the Applicable Margin Percentage for Base Rate Loans plus the higher of Wells Fargo’s prime rate, the federal funds rate plus 0.5% per annum, or the one month LIBOR Rate plus 1.0% per annum; (b) the LIBOR Rate plus the Applicable Margin Percentage for LIBOR Loans; or (c) the LIBOR Market Index Rate (“LIBOR Index Rate”) plus the Applicable Margin Percentage for LIBOR Market Index Loans. The Applicable Margin Percentage is determined by a pricing grid in the Credit Agreement and ranges from 1.0% to 1.875%. The Applicable Margin Percentage was 1.125% for the period this Credit Agreement was in effect during the third quarter of 2011. Revolving loans under the sweep program bear interest at the LIBOR Index Rate.

There was no outstanding balance on the line of credit facility at September 30, 2011. The outstanding balance of borrowings on the line of credit facility was $66.2 million at December 31, 2010. There were $50.8 million and $49.6 million of outstanding letters of credit at September 30, 2011 and December 31, 2010, respectively.

Note 3. Shareholders’ Equity

We entered into an At-The-Market Equity Offering Sales Agreement on February 2, 2011 pursuant to which we have the ability to issue and sell, from time to time over a 12-month period, shares of our common stock having an aggregate offering price of up to $100.0 million (the “ATM program”). Set forth below is information regarding our ATM program from February 2, 2011 through September 30, 2011.

There were no shares issued pursuant to the ATM program during the quarters ended June 30, 2011 or September 30, 2011.

Note 4. 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 and determined, will have a material adverse effect on our financial position or results of operations.

Note 5. Subsequent Events

Management evaluated all subsequent events and transactions through the issuance date of these financial statements, and concluded that no subsequent events or transactions have occurred that require recognition or disclosure in our financial statements.

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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 less-than-truckload (“LTL”), non-union motor carrier providing regional, inter-regional and national LTL service and value-added logistics services from a single integrated organization. In addition to our LTL services, we offer our customers a broad range of logistics services including ground and air expedited transportation, supply chain consulting, transportation management, truckload brokerage, container delivery and warehousing services. Through marketing and carrier relationships, we also offer door-to-door international freight services to and from all of North America, Central America, South America and the Far East. More than 90% of our revenue has historically been derived from transporting LTL shipments for our customers, whose demand for our services is generally tied to industrial production and the overall health of the U.S. domestic economy.

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

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, platform pounds handled per hour and platform shipments per hour. In addition to our focus on density, it is critical for us to obtain an appropriate revenue yield on the shipments we handle. We manage our yields by focusing on individual account profitability. We believe yield management and improvements in density are key components in our ability to produce profitable growth.

Our primary cost elements are direct wages and benefits associated with the movement of freight; operating supplies and expenses, which include fuel and equipment repairs; and depreciation of our equipment fleet and service center facilities. We gauge our overall success in managing these costs by

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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. Our technology provides our customers with visibility of their shipments throughout our network, increases the productivity of our workforce and provides key metrics from which we can monitor our processes.

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-month and nine-month periods ended September 30, 2011 and 2010 are presented below:

For the third quarter of 2011, we produced the highest quarterly revenue and lowest operating ratio in our 20-year history as a public company. Revenue grew 24.9% to $494.5 million and our operating ratio improved to 86.2% in the third quarter of 2011. Net income and earnings per share for the third quarter of 2011 were $38.6 million and $0.67, respectively. For the first nine months of 2011, our revenue was $1.4 billion compared to $1.1 billion for the same period in 2010. For the first nine months of 2011, our net income and earnings per share were $99.6 million and $1.75, respectively, as compared to $53.6 million and $0.96 for the comparable period of the prior year.

Revenue for the third quarter and first nine months of 2011 continued to reflect higher tonnage levels and improved pricing over 2010 levels. The additional tonnage for both the three- and nine-month periods in 2011 over the prior year improved our density in nearly every area of our operations, which has generally resulted in improved productivity metrics and profitability. We believe our ongoing tonnage growth is a direct result of our ability to win market share by providing industry-leading service at fair and consistent prices. Our service performance through the first nine months of 2011 includes on-time deliveries of 99% and a cargo claims ratio of 0.49%. We also believe our brand recognition is increasing due to our excellent service reputation and increased marketing and advertising.

Revenue

Revenue growth for the third quarter and first nine months of 2011 was driven by tonnage growth and improvements in pricing. We believe our year-over-year tonnage growth of 9.6% and 14.3% for the three- and nine-month periods is due to market share gains and to a much lesser extent, some improvement in the overall domestic economy. Although we opened three new service centers in Casper, Wyoming; Madison, Wisconsin; and Altoona, Pennsylvania in the twelve-month period ended September 30, 2011, the majority of our tonnage growth was generated in our existing areas of operations.

Revenue per hundredweight for the third quarter improved 13.7% to $14.82 from $13.04 for the third quarter of 2010. For the first nine months of 2011, revenue per hundredweight improved 13.0% to $14.62 from $12.94 in the comparable prior-year period. These increases reflect an improving LTL pricing environment as a result of less available capacity in our markets and more rational competitive pricing, as other market participants seek to reach or sustain higher levels of profitability. We remain committed to our disciplined yield management process, as we did throughout the recent economic downturn, and believe the high level of service we offer provides value to our customers. In keeping with this philosophy, we implemented a 4.9% general rate increase to our base rates on September 6, 2011.

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The improvement in revenue per hundredweight for the quarter and year-to-date periods in 2011 also reflects a significant increase in fuel surcharges, which are designed to offset fluctuations in the cost of petroleum-based products and are one of many components included in the overall price for our services. Fuel surcharge revenue increased to 16.6% and 16.5% of revenue in the three- and nine-month periods of 2011, respectively, from 12.0% of revenue for the comparable periods in 2010. These increases are the result of a significant increase in diesel fuel prices for the periods compared. Excluding fuel surcharges, revenue per hundredweight increased 7.8% and 7.5% from the third quarter and first nine months of 2010, respectively.

Revenue per hundredweight is also influenced by many other factors, such as changes in weight per shipment, length of haul and class of freight; therefore, changes in revenue per hundredweight do not necessarily indicate actual changes in our underlying rates. As a result, our revenue per hundredweight was positively influenced by both decreases in weight per shipment and increases in our length of haul for both the third quarter and the first nine months of 2011.

Operating Costs and Other Expenses

Salaries, wages and benefits for the third quarter of 2011 increased $33.8 million, or 15.8% over the prior-year period and increased $117.6 million, or 19.9% for the comparable nine-month period. As a result of significant revenue growth in 2011, these costs decreased to 50.0% and 50.7% of revenue for the quarter and first nine months of 2011, respectively, from 53.9% and 54.6% for the comparable periods in 2010. Salaries and wages, excluding benefits, increased $25.2 million and $87.7 million for the third quarter and first nine months of 2011, primarily due to an increase in our number of full-time employees and the impact of annual wage increases provided to employees in September 2011 and 2010. To support our growth, our full-time headcount increased 11.0% to 11,980 at September 30, 2011 from 10,797 at September 30, 2010. Also contributing to the increase in salary and wages for both comparable periods was an increase in performance-based compensation due to the improvement in our financial and operational results.

Our productivity metrics for the third quarter of 2011 were favorably impacted by the increased density throughout our network that the additional tonnage and shipments generated. Compared to the third quarter of 2010, P&D shipments per hour increased 1.6%, platform pounds handled per hour increased 3.6% and linehaul laden load average increased 0.2%. For the nine-month comparable period, P&D shipments per hour increased 1.1% while platform pounds handled per hour decreased 1.6% and linehaul load average decreased 0.1%. These 2011 productivity metrics, however, were also unfavorably impacted by the cost to recruit and train new employees to support our growth in 2011, particularly during the first half of the year.

Benefit costs increased $8.6 million and $29.9 million over the third quarter and first nine months of 2010, respectively, primarily due to the increase in the number of full-time employees eligible for our benefits. In addition, unfavorable claims experience led to an increase in our self-insured workers’ compensation and our group health and dental costs for both the quarter and year-to-date periods. Our benefit costs as a percent of salaries and wages increased to 30.8% and 31.6% in the third quarter and first nine months of 2011, respectively, from 30.3% and 31.1% in the comparable periods of the prior year.

Operating supplies and expenses increased to 18.4% of revenue from 15.8% for the third quarter of 2010 and increased to 18.9% of revenue from 16.2% for the first nine months of 2010. These increases are primarily the result of higher diesel fuel costs, excluding fuel taxes, which is the largest component of operating supplies and expenses. Our diesel fuel costs, excluding fuel taxes, increased 52.5% and 60.1% over the third quarter and first nine months of 2010, respectively, due to increases in our average price per gallon and increased consumption. The year-over-year increase for the third quarter resulted from increases in our average price per gallon and gallons consumed of 33.7% and 8.4%, respectively. The year-over-year increase for the first nine months of 2011 resulted from increases in our average price per gallon and gallons consumed of 32.7% and 14.8%, respectively. We do not use diesel fuel hedging instruments and are therefore subject to market fluctuations, which we attempt to offset with additional revenue generated by fuel surcharges.

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Our revenue growth has generated operating leverage from our fixed asset structure as reflected in the reduction of depreciation and amortization expense as a percent of revenue to 4.7% and 4.8% for the third quarter and first nine months of 2011, respectively, from 4.9% and 5.6% for the comparable periods in 2010. We achieved this leverage early in 2011 by utilizing excess tractor and trailer capacity that was strategically retained in our operations in 2010 in anticipation of improved demand for our services. This operating leverage has since declined due to the increase in our capital expenditures during 2011, which provided additional capacity to accommodate growth and to replace units scheduled for retirement. Following the completion of our 2011 capital expenditures, as well as increased capital expenditures planned for 2012, we anticipate our depreciation and amortization costs will increase as a percent of revenue.

Other expense (income), net includes the net investment gains or losses on the cash value of our variable life insurance contracts related to our non-qualified deferred compensation plans. The cash value of these contracts and plan participants’ investment earnings were impacted by the decline in equity markets during the third quarter of 2011, which resulted in a net loss of $1.3 million. Year-to-date 2011 also includes a $1.6 million gain recorded in the first quarter of 2011 as a result of the receipt of proceeds from two of the life insurance policies.

Our effective tax rate was 38.8% and 37.5% for the third quarter and first nine months of 2011, as compared to 40.0% for the same periods of the prior year. The second quarter of 2011 included a favorable adjustment for prior tax years of $2.0 million, which lowered the effective tax rate for the first nine months of 2011. We expect our effective tax rate for the fourth quarter of 2011 to be 38.8%. Our effective tax rate also includes the impact of state taxes and, to a lesser extent, certain non-deductible items.

Liquidity and Capital Resources

A summary of our cash flows is presented below:

The increase in our cash flows provided by operating activities during the first nine months of 2011 as compared to the same period in the prior year is due primarily to the significant improvement in our results of operations, which are described above in Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations - Results of Operations.” Changes in cash flows used in investing activities are primarily due to a significant increase in our planned capital expenditures for 2011 following a reduction of capital outlays during the uncertain economic environment in 2010. These changes in our capital expenditure program are more fully described in Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations - Capital Expenditures.” Changes in cash flows provided by financing activities for the nine-month periods presented above consist of fluctuations in our senior unsecured revolving line of credit, scheduled principal payments, and debt and equity issuances in the first nine months of 2011. In January 2011, we completed a $95 million private placement of senior notes and in March 2011 we received net proceeds of $48.4 million resulting from the issuance of our common stock, as discussed in more detail below. A portion of the proceeds from these transactions were used to satisfy the outstanding balance on our senior unsecured revolving line of credit.

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We have three primary sources of available liquidity to fund our estimated capital expenditures: cash and cash equivalents, cash flows from operations and available borrowings under our senior unsecured revolving credit agreement, which is described below. We believe we also have sufficient access to debt and equity markets to provide other sources of liquidity, if needed.

On January 3, 2011, we entered into a Note Purchase Agreement pursuant to which we issued $95.0 million of privately-placed senior notes. We entered into this Note Purchase Agreement to fund planned capital expenditures and for general corporate purposes. In addition, we used a portion of the proceeds to refinance existing indebtedness, including paying down the outstanding balance on our senior unsecured revolving credit agreement.

To facilitate our access to the equity market, we filed an automatic shelf registration statement with the Securities and Exchange Commission (the “SEC”) during the fourth quarter of 2009 that provides us with the opportunity to offer and sell shares of common stock on a delayed or continuous basis at indeterminate prices from time to time. Pursuant to this automatic shelf registration, we filed a prospectus supplement and entered into an At-The-Market Equity Offering Sales Agreement on February 2, 2011 with Stifel, Nicolaus & Company, Incorporated (“Stifel Nicolaus Weisel”) pursuant to which we have the ability to issue and sell, from time to time over a 12-month period through or to Stifel Nicolaus Weisel, shares of our common stock having an aggregate offering price of up to $100.0 million (the “ATM program”). From February 2, 2011 through September 30, 2011, we issued 1,516,379 shares of common stock at an average price of $32.69 per share pursuant to the ATM program for aggregate gross proceeds of $49.6 million and aggregate net proceeds of $48.4 million, after deducting commissions and other transaction costs of $1.2 million. There have been no subsequent issuances pursuant to the ATM program through the date of this Quarterly Report on Form 10-Q. While we have the option of obtaining additional financing through the ATM program, we may not always be able to do so on terms acceptable to us.

Capital Expenditures

Our capital expenditure requirements are generally based upon expansion in the number and size of service center facilities to support our plan for long-term growth, our planned tractor and trailer replacement cycle and forecasted revenue growth. These requirements can vary widely from year to year depending upon our needs for and the availability of property and equipment. We used $209.9 million to purchase property and equipment during the first nine months of 2011.

The table below sets forth our capital expenditures for property and equipment, including capital assets obtained through acquisition of business assets and capital leases, for the nine-month period ended September 30, 2011 and the years ended December 31, 2010, 2009 and 2008:

We currently project aggregate capital expenditures, net of anticipated proceeds from dispositions, to be in a range between $245 million and $265 million for the year ending December 31, 2011. Of our capital expenditures, approximately $80 million to $90 million is allocated for the purchase of service center facilities, construction of new service center facilities or expansion of existing service center facilities, subject to the availability of suitable real estate and the timing of construction projects; approximately $150 million to $155 million is allocated for the purchase of tractors, trailers and other equipment; and approximately $15 million to $20 million is allocated for investments in technology. We

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plan to fund the remaining balance of our capital expenditures through the use of existing cash and cash equivalents, cash flows from operations and our borrowing capacity. We believe our current sources of liquidity will be sufficient to satisfy our expected capital expenditures.

Financing Agreements

We entered into a five-year, $200.0 million senior unsecured revolving credit facility pursuant to the terms of a second amended and restated credit agreement on August 10, 2011 (the “Credit Agreement”), with Wells Fargo Bank, National Association (“Wells Fargo”) serving as administrative agent for the lenders. This Credit Agreement amended and restated the terms of the existing $225.0 million amended and restated senior unsecured revolving credit facility dated August 10, 2006. Of the $200.0 million line of credit commitments, $150.0 million may be used for letters of credit and $20.0 million may be used for borrowings under the Wells Fargo Sweep Plus Loan Program. We utilize the sweep program to manage our daily cash needs, as the sweep program automatically initiates borrowings to cover overnight cash requirements up to an aggregate of $20.0 million 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 $300.0 million in minimum increments of $25.0 million. The amounts outstanding and available borrowing capacity under the Credit Agreement are presented below:

We have three outstanding unsecured senior note agreements with an aggregate amount outstanding of $262.9 million at September 30, 2011. These notes call for periodic principal payments with maturities that range from 2015 to 2021, of which $35.7 million is due in the next twelve months. Interest rates on these notes are fixed and range from 4.00% to 5.85%. The effective average interest rate on our outstanding senior note agreements was 5.13% and 5.54% at September 30, 2011 and December 31, 2010, respectively.

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.

Our Credit Agreement limits the amount of dividends that may be paid to shareholders to the greater of (i) $20.0 million; (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 first nine months of 2011, and we have no plans to declare or pay a dividend during the remainder of 2011.

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. As of September 30, 2011, we were in compliance with these covenants. We do not anticipate a significant decline in business levels or financial performance that would cause us to violate any such covenants in the future, and we believe our borrowing capacity will be sufficient to meet foreseeable 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, 2010 that affect judgments and estimates of amounts recorded for certain assets, liabilities, revenue and expenses.

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Seasonality

Our tonnage levels and revenue mix are subject to seasonal trends common in the motor carrier industry, although other factors, such as the economy, could cause variation in these trends. Operating margins 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 or early fourth quarter, which generally results in improved operating margins for those periods. We believe seasonal trends will continue to impact our business.

Environmental Regulation

We are subject to various federal, state and local environmental laws and regulations that govern, among other things: the emission and discharge of hazardous materials into the environment; the presence of hazardous materials at our properties or in our vehicles; fuel storage tanks; the transportation of certain materials; and the discharge or retention of storm water. Under certain 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, as well as costs associated with clean-up of accidents involving our vehicles. We do not believe that the cost of future compliance with current environmental laws or regulations will have a material adverse effect on our operations, financial condition, competitive position or capital expenditures for the remainder of fiscal year 2011 or fiscal year 2012. However, future changes to laws or regulations may adversely affect our operations and could result in unforeseen costs to our business.

Forward-Looking Information

Forward-looking statements appear in this report, including but not limited to “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. These forward-looking statements include, but are not limited to, statements relating to our goals, strategies, expectations, competitive environment, regulation, availability of resources, future events and future financial performance. Such forward-looking statements are made pursuant to the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. These forward-looking statements typically can be identified by such words as “anticipate,” “estimate,” “forecast,” “project,” “intend,” “expect,” “believe,” “should,” “could,” “may,” or other similar words or expressions. We caution readers that such forward-looking statements involve risks and uncertainties, including, but not limited to, the risk factors set forth in our Annual Report on Form 10-K for the year ended December 31, 2010 and in other reports and statements that we file with the SEC. We caution readers that such forward-looking statements involve risks and uncertainties that could cause actual events or results to differ materially from those expressed or implied herein, including, but not limited to, the following:

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Our forward-looking statements are based upon our beliefs and assumptions using information available at the time the statements are made. We caution the reader not to place undue reliance on our forward-looking statements (i) as these statements are neither a prediction nor a guarantee of future events or circumstances and (ii) the assumptions, beliefs, expectations and projections about future events may differ materially from actual results. We undertake no obligation to publicly update any forward-looking statement to reflect developments occurring after the statement is made, except as otherwise required by law.

Item 3. Quantitative and Qualitative Disclosures about Market Risk

Market risk represents the risk of loss that may impact our 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 agreement, which have variable interest rates. On January 3, 2011, however, we used a portion of the proceeds from our $95.0 million issuance of senior notes to repay the outstanding borrowings on the senior unsecured revolving credit agreement. Since that time, there have been no additional borrowings under the credit agreement. We have established policies and procedures to manage our exposure to market risk and use major institutions that we believe are creditworthy to minimize credit risk.

We are exposed to market risk for equity investments relating to Company-owned life insurance contracts on certain employees. Variable life insurance contracts expose us to fluctuations in equity markets; however, we utilize a third-party to manage these assets and minimize that exposure.

We are also exposed to commodity price risk related to petroleum-based products, including diesel fuel, and manage our exposure to this risk primarily through the application of fuel surcharges.

For further discussion related to these risks, see “Management’s Discussion and Analysis of Financial Condition and Results of Operations” included in Item 2 of this report.

Item 4. Controls and Procedures

As of the end of the period covered by this quarterly report, our management, with the participation of our Chief Executive Officer (“CEO”) and Chief Financial Officer (“CFO”), conducted an evaluation of the effectiveness of our disclosure controls and procedures in accordance with Rule 13a-15 under the Securities Exchange Act of 1934, as amended (the “Exchange Act”). Based on the evaluation of our

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disclosure controls and procedures as of the end of the period covered by this quarterly report, our CEO and CFO concluded that, as of such date, our disclosure controls and procedures were effective to ensure that information required to be disclosed by us in the reports that we file or submit under the Exchange Act is (a) accumulated and communicated to our management, including our CEO and CFO, as appropriate to allow timely decisions regarding required disclosure, and (b) recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms.

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.

PART II. OTHER INFORMATION

Item 1. Legal Proceedings

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 and determined, will have a material adverse effect upon our financial position or results of operations.

Item 1A. Risk Factors

In addition to the other information set forth in this report and in our other reports and statements that we file with the SEC, including our quarterly reports on Form 10-Q, careful consideration should be given to the factors discussed in Part I, “Item 1A. Risk Factors” in our Annual Report on Form 10-K for the year ended December 31, 2010, 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.

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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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