Del. Code tit. 17 § 1125
The Department may enter into agreements, consistent with this chapter, with the Secretary of Transportation of the United States relating to the control of outdoor advertising in controlled areas and take action in the name of the State to comply with the terms of such agreements.
The Department may accept allotment of funds by the United States, or any department or agency thereof, authorized by the Federal-Aid Highway Act of 1958, or any subsequent legislation supplementary to or amending such Act, in connection with any agreement entered into by the Department and the Secretary of Transportation of the United States relating to the control of outdoor advertising in controlled areas adjacent to the interstate and/or primary system.
17 Del. C. § 1125