Compliance

All persons using limited access state highways shall comply with the commission rules and regulations, signs, signals and markings except as follows: (a) When engaged in official duties, personnel of the commission, department of transportation, motor vehicle department, state and local police departments and operators of emergency vehicles shall be exempt from these regulations; (b) Contractors and their employees engaged in construction, maintenance and/or landscaping or surveys directly related to traffic with the written approval of the commissioner or his authorized representative shall be exempt from these regulations.