Non-motorized access on freeways
Non-motorized access on freeways may allow or restrict pedestrians, bicyclists and other non-motorized traffic to use a freeway. Such roads are public ways intended primarily for high-speed travel over long distances, and they have resulted in highways in the United States with engineering features such as long sight-distances, wide marked lanes and the absence of cross traffic.
Source: Wikipedia — Non-motorized access on freeways (CC BY-SA 4.0)