FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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(Print or Type Responses)

1. Name and Address of Reporting Person * KNIGHT TRANSPORTATION INC   2. Issuer Name and Ticker or Trading Symbol USA TRUCK INC [USAK] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director __X__ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 20002 NORTH 19TH AVENUE 3. Date of Earliest Transaction (Month/Day/Year) 05/13/2014 (Street) PHOENIX, AZ 85027 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common stock, par value $0.01 per share 05/13/2014   S   101,400 (1) D $ 17.1 (1) 1,203,117 (1) I See footnote (3) Common stock, par value $0.01 per share 05/14/2014   S   10,000 (2) D $ 17.02 (2) 1,193,117 (2) I See footnote (3)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

4. Transaction Code (Instr. 8)

5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5)

6. Date Exercisable and Expiration Date (Month/Day/Year)

7. Title and Amount of Underlying Securities (Instr. 3 and 4)

8. Price of Derivative Security (Instr. 5)

9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)

10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)

11. Nature of Indirect Beneficial Ownership (Instr. 4)

Code

V

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
KNIGHT TRANSPORTATION INC 20002 NORTH 19TH AVENUE PHOENIX, AZ 85027		X

Signatures

/s/ Kevin P. Knight, Authorized Officer		05/15/2014
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	The 101,400 shares reported were sold on May 13, 2014. Such shares were sold in multiple transactions, at a weighted average price per share of approximately $17.10. The number of shares owned by the reporting persons following such sales was 1,203,117. The reporting persons undertake to provide to the issuer, any stockholder of the issuer or the staff of the United States Securities and Exchange Commission, upon request, full information regarding the shares sold in each transaction.
(2)	The 10,000 shares reported were sold on May 14, 2014. Such shares were sold in multiple transactions, at a weighted average price per share of approximately $17.02. The number of shares owned by the reporting persons following such sales was 1,193,117. The reporting persons undertake to provide to the issuer, any stockholder of the issuer or the staff of the United States Securities and Exchange Commission, upon request, full information regarding the shares sold in each transaction.
(3)	Knight Transportation, Inc. ("Knight Transportation") is an indirect owner of these shares. These shares are owned directly by Knight Capital Growth LLC, a wholly-owned subsidiary of Knight Transportation.

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