The Sunset Highway works its way east to west across the 300-mile-wide expanse of Washington State from the Spokane River to its ending at Seattle on Puget Sound. Later known as Highway 10, the route traverses a landscape of big cities, small towns, and wide-open spaces; rolling hills and rugged mountains; fertile fields of grain, apple orchards, and ranches; roaring streams, deep rivers, and rock-walled coulees--now dry, but once a mighty watercourse. The Sunset Highway arose from a collection of existing wagon roads, becoming the main cross-state thoroughfare with highway improvements. As traffic increased, roadside businesses sprang up to accommodate motorists. In towns, bright neon lights attracted both locals and passers-through, while tourist courts, restaurants, burger stands, and service stations lined the highway approaches.