The Department of Transportation may erect and maintain all appropriate signals, lights or any other type of sign on private property over which the Department of Safety and Homeland Security has assumed jurisdiction. Nothing in this section shall be construed to prohibit the erection and maintenance of signs and signals by the private owners of the real property, so long as such signs and signals are for the safety and convenience of the public and are approved by the Department of Transportation.

21 Del. C. 1953, § 503; 58 Del. Laws, c. 515, § 2; 60 Del. Laws, c. 503, § 23; 74 Del. Laws, c. 110, § 138