Signals, Signs and Pavement Markings · Guide Signs
Route Number Signs
The shape and color of a route number sign indicate the type of roadway: interstate, U.S., state, city, or county road. When planning a trip, use a road map to determine your route. During the trip, follow the route signs to keep from getting lost.
Learn it with your state's rules
DMV One Way teaches the whole handbook slide by slide and checks it with practice questions.