17 Del. C. § 172

For the purposes of this subchapter, a controlled-access facility is defined as a highway especially designed for through motor vehicle traffic, and over, from or to which owners or occupants of abutting land or other persons have no right or easement or only a controlled right or easement of access, light, air or view by reason of the fact that their property abuts upon such controlled-access facility or for any other reason. Such highways may be freeways open to use by all customary forms of highway traffic, or they may be parkways from which trucks, buses and other commercial vehicles shall be excluded, or they may be multi-modal corridors where the absence or restriction of turning vehicle movements enables safer movement of people and goods via multiple modes of travel.