Rest area
A rest area (or service area (RSA), service station) is a public facility located next to a highway at which drivers and passengers can rest, eat, or refuel without exiting on to secondary roads. It can be a great place for hitchhiking: you can ask for a ride when drivers re-fill or wander around the area, or you can stand by its exit (that leads to a motorway) and hitchhike there.
Facilities of the rest area may include park-like areas, fuel stations, restrooms, and restaurants. Rest areas are common in the United States, Canada, Australia and parts of Europe and Asia.
Not all rest areas include petrol stations - this means that the traffic on such rest areas will be much lower, and one can expect more difficulties when looking for a ride there. For service areas with gas stations see information here.