POWER OF ATTORNEY

The undersigned hereby constitutes and appoints James J.
Hinnendael and Kathy A. Degenharddt and each of them signing
singly, and with full power of substitution, to be the
undersigned's true and lawful attorney-in-fact to:

(1)	execute for and on behalf of the undersigned, in the
undersigned's capacity as an officer and/or director of Marten
Transport, Ltd. (the Company), Forms 3, 4 and 5 in accordance
with Section 16(a) of the Securities Exchange Act of 1934, as
amended, and the rules promulgated thereunder from time to time
(collectively, the Act);

(2)	do and perform any and all acts for and on behalf of
the undersigned which may be necessary or desirable to complete
and execute any such Form 3, 4 or 5, complete and execute any
amendment or amendments thereto, and timely file such form
with the United States Securities and Exchange Commission and
any stock exchange or similar authority; and

(3)	take any other action of any type whatsoever in
connection with the foregoing which, in the opinion of
such attorney-in-fact, may be of benefit to, in the best
interest of, or legally required by, the undersigned, it
being understood that the documents executed by such
attorney-in-fact on behalf of the undersigned pursuant
to this Power of Attorney shall be in such form and shall
contain such terms and conditions as such attorney-in-fact
may approve in such attorney-in-fact's discretion.

The undersigned hereby  grants to each such attorney-in-fact
full power and authority to do and perform any and every act
and thing whatsoever requisite, necessary, or proper to be
done in the exercise of any of the rights and powers herein
granted, as fully to all intents and purposes as the
undersigned might or could do if personally present, with
full power of substitution or revocation, hereby ratifying
and confirming all that such attorney-in-fact, or such
attorney-in-fact's substitute or substitutes, shall lawfully
do or cause to be done by virtue of this power of attorney
and the rights and powers herein granted. The undersigned
acknowledges that the foregoing attorneys-in-fact, in
serving in such capacity at the request of the undersigned,
are not assuming, nor is the Company assuming, any of the
undersigned's responsibilities to comply with the Act.

This Power of Attorney shall remain in full force and effect
until the undersigned is no longer required to file Forms 3,
4 and 5 with respect to the undersigned's holdings of and
transactions in securities issued by the Company, unless
earlier revoked by the undersigned in a signed writing
delivered to the foregoing attorneys-in-fact.

IN WITNESS WHEREOF, the undersigned has caused this Power
of Attorney to be executed as of this 13th day of December
2023.

/s/ Adam D. Phillips
Adam D. Phillips