The Department may prohibit the use of specific classes of motor-driven vehicles or of other vehicles on controlled-access highways either all the time or during such times as necessary for safety. Notice of such prohibition shall be posted on traffic-control devices at the entrance to the controlled-access facilities.

17 Del. C. 1953, § ?179; 50 Del. Laws, c. 603, § ?1; 60 Del. Laws, c. 701, § ?4;