Haw. Rev. Stat. § 286-103: Restrictions on driver's license; rules and regulations.

The examiner of drivers may adopt rules and regulations restricting the use of a driver's license in any manner the examiner of drivers may deem necessary for the safety and welfare of the traveling public and may impose restrictions with respect to the type of equipment or special mechanical control devices required on the motor vehicle operated by the licensee appropriate to the driving ability of the licensee. Any restrictions shall be indicated on the license issued.