In the United Sates, there are often welcome centers or rest stations that provide free state maps. When on the interstate, take the time to stretch your legs and pick up an official state map.
A state map from the state’s Department of Transportation provides information and details not normally found on your national atlas. State maps can offer facts about driving laws, attractions, and locations — as well as invaluable, detailed city maps (usually on the reverse side). State maps also serve as excellent (free) mementos of your trip.
So remember, new state, new map.