KRS 281A.090: Restrictions on driving.

(1) Except when driving under a commercial learner's permit and accompanied by the

holder of commercial driver's license valid for the vehicle being driven, no person

shall drive a commercial motor vehicle on the highways of this state unless the

person holds a valid commercial driver's license with applicable endorsements valid

for the vehicle he or she is driving.

(2) No person shall drive a commercial motor vehicle on the highways of this state

while his or her driving privilege for a commercial or noncommercial motor vehicle

is suspended, revoked, or canceled, or while he or she is subject to a

disqualification, or in violation of an out-of-service order.

(3) The licensee shall have in his or her immediate possession at all times when

operating a motor vehic le his or her commercial driver's license, and shall display

the license upon demand to the Transportation Cabinet, a license examiner, a peace

officer, a State Police officer, or an inspector or officer of the Department of

Vehicle Regulation. It shall be a defense to a violator of this subsection if the

person so charged produces in court a commercial driver's license, issued to him or

her before his or her arrest or violation and which was valid at that time.