Idaho's major freeways cross the state and play an important role in inter-regional travel and logistics.

Here is information about the major freeways in Idaho.

Interstate 84 (I-84)

• The main east-west arterial road in Idaho, one of the most important freeways crossing the state.
• Route: Starts at the western border of the state in Oregon and connects to Utah to the east via Boise.
• Main cities: Boise, Nampa, Meridian, Twin Falls.
• Role: Plays a key role in logistics and tourism, with frequent truck transport.

Interstate 15 (I-15)

• A freeway that runs north-south, providing regional connectivity through eastern Idaho.
• Route: Starts in Montana, passes through Idaho Falls, and continues to Utah.
• Main cities: Pocatello, Idaho Falls.
• Role: An important route for both tourists and freight transport.

Interstate 90 (I-90)

• A major freeway connecting the northern United States east-west, passing through northern Idaho.
• Route: Starts in Washington, passes through Coeur d'Alene, and connects to Montana.
• Main city: Coeur d'Alene.
• Role: A traffic hub for the northern region, especially important for tourism and logistics.

Interstate 86 (I-86)

• A short freeway branching from I-84, connecting to eastern Idaho.
• Route: Starts near Boise, passes through American Falls, and joins I-15.
• Role: Complements inter-regional traffic, primarily used in the eastern region.

In addition, U.S. Highway 20 and U.S. Highway 93 also play important roles within Idaho.

These freeways are lifelines for the regional economy and mobility, making significant contributions to logistics and tourism.