A moterway is a high speed, multi lane road that cuts accross the country, in theory you can drive at speeds of 70+ miles an hour all the way to your destination, but since the roads cut across the middle of nowhere, there is literally nowhere to go if you need food or a toilet, so every 50 miles or so there is a service station, which usually has shops, resteraunts, toilets and a motel.
Typically everything costs twice as much there, because you literarly have nowhere else to go if you want something.