off-ramp 
noun North American
A sloping one-way road leading off a main highway.There are expressways, smaller lanes, on-ramps and off-ramps and intersections....
- Looking out at chain-link fences, gantry cranes, and a highway off-ramp at the edge of San Francisco Bay, I am in a very unlikely site to appreciate nature.
- Motion adaptation can also cause problems when a driver exits a highway and enters an off-ramp, said Dr. Gray.