Del. Code tit. 17 § 173
The Department, acting alone or in cooperation with any other governmental agency or political subdivision of this State or with any federal, state or local agency of any other state having authority to participate in the construction and maintenance of highways, may plan, designate, establish, regulate, vacate, alter, improve, maintain and provide controlled-access facilities for public use wherever the Department is of the opinion that traffic conditions, present or future, will justify such special facilities, provided that within cities and towns such authority shall be subject to such municipal consent as may be provided by law. The Department, in addition to the specific powers granted in this subchapter, shall also have and may exercise, relative to controlled-access facilities, any and all additional authority now or after June 22, 1956, vested in it relative to highways or streets within its jurisdiction. The Department may regulate, restrict or prohibit the use of such controlled-access facilities by the various classes of vehicles or traffic in a manner consistent with § 172 of this title.
17 Del. C. § 173