A controlled access highway is a type of road designed for vehicles moving at controlled speed, with all traffic ingress and egress regulated. Controlled access highways provide an unhindered flow of traffic, with no traffic signals, intersections or property access. They are free of any at-grade crossings with other roads, railways or pedestrian paths, which are instead carried by overpasses and underpasses. Entrances and exits to the highway are provided at interchanges by ramps, which allow for speed changes between the highway and arterials and collector roads.

Controlled Access illustration

Illustration: Controlled Access

 

Controlled Access photo

Photograph: Controlled Access

A. Controlled Access Highway

B. Access Exit Ramp

C. Access Entrance Ramp

D. Access Road