A combination of a restaurant, gas station, and convenience store which caters to truckers and other long-distance travelers.
Many of them are mighty unpleasant places, with surly waitresses, filthy bathrooms, and inedible and overpriced food. Luckily, most truck stops take an attitude that they're also providing a pleasant break from the road, so they do all they can to offer clean facilities, good food, and a safe place to rest. and you should do everything you can to help them stay in business.