Haw. Rev. Stat. § 286-235: Commercial driver's license required.

(a) No person shall drive a commercial motor vehicle unless the person holds a valid commercial driver's license and valid applicable endorsements and restrictions for the vehicle the person is driving, except when driving under a commercial learner's permit and accompanied by the holder of a valid commercial driver's license for the vehicle being driven.

(b) No person shall operate a commercial motor vehicle without a commercial driver's license in such person's possession.

(c) No person shall drive a commercial motor vehicle while the person's driver's license or permit is suspended, revoked, or canceled, or while subject to a disqualification.

(d) No person shall drive a commercial motor vehicle in violation of an out-of-service order.