* Interstate 84: This east-west interstate crosses the southern part of Idaho, passing through cities such as Boise, Twin Falls, and Pocatello.
* Interstate 90: This east-west interstate crosses the northern part of Idaho, passing through cities such as Coeur d'Alene, Post Falls, and Coeur d'Alene.
U.S. Highways
* U.S. Highway 95: This north-south highway runs through the western part of Idaho, passing through cities such as Weiser, Payette, and McCall.
* U.S. Highway 20: This east-west highway crosses the southern part of Idaho, passing through cities such as Idaho Falls, Blackfoot, and Arco.
* U.S. Highway 26: This east-west highway crosses the northern part of Idaho, passing through cities such as Rexburg, Ashton, and Dubois.
State Highways
Idaho also has a network of state highways that connect cities and towns throughout the state. Some of the most important state highways include:
* State Highway 3: This north-south highway runs through the western part of Idaho, connecting Boise to Cascade.
* State Highway 44: This east-west highway connects Boise to McCall.
* State Highway 55: This north-south highway runs through the eastern part of Idaho, connecting Idaho Falls to Montpelier.
* State Highway 75: This east-west highway connects Sun Valley to Stanley.
* State Highway 93: This north-south highway runs through the central part of Idaho, connecting Shoshone to Challis.