Idaho Truck Bans & Hazmat Routes

Where Idaho keeps trucks out

Idaho runs no cars-only parkways and no metro tunnel that bans hazmat. The limits are local and by size. Oversize loads more than 13 ft wide cannot move on state roadways 6-9 AM or 4-6:30 PM Monday through Friday in ten areas: Boise valley, Coeur d'Alene, Eagle, Emmett, Garden City, Idaho Falls, Middleton, Pocatello valley, Star and Twin Falls (IDAPA 39.03.01.305.08). Hazmat at 10,000 lb or more must stop at open ports of entry even under 26,000 (Idaho Code 40-511). Placarded loads follow 49 CFR 397. Read local signs and Idaho 511.

Key restrictions

• No cars-only parkways and no metro hazmat tunnel ban; the real limits are local and by size
• Oversize loads more than 13 ft wide cannot move on state roadways 6-9 AM or 4-6:30 PM Monday through Friday in ten areas: Boise valley, Coeur d'Alene, Eagle, Emmett, Garden City, Idaho Falls, Middleton, Pocatello valley, Star and Twin Falls (IDAPA 39.03.01.305.08)
• Placarded hazmat at 10,000 lb gross or more must stop at open ports of entry even under 26,000 lb (Idaho Code 40-511)
• Follow 49 CFR 397, the FMCSA registry, and Idaho 511 for live truck restrictions

• Parkway / road ban: No cars-only parkways. Idaho is a truck-friendly state; the limits you hit are local size and time-of-day rules, not commercial-vehicle bans.
• Hazmat: No metro tunnel or bridge hazmat ban. Placarded loads default to the Interstate System and any Idaho-designated or preferred routes in the FMCSA registry (49 CFR 397). Vehicles at 10,000 lb gross or more hauling placardable quantities of hazmat must stop at every open port of entry even if the rig is under 26,000 lb (Idaho Code 40-511).
• Through-truck routes: Cities may post truck routes and local weight limits, but there is no mandatory citywide truck-route network like NYC. Oversize permitted loads more than 13 ft wide may not move on state roadways during heavy commuter traffic, which unless your permit says otherwise runs 6-9 AM and 4-6:30 PM local time Monday through Friday. It applies at the listed mileposts or within 1 mile of the city limits of ten areas: Boise valley (I-84 MP 26 to 59), Coeur d'Alene (I-90 MP 0 to 17), Eagle, Emmett, Garden City, Idaho Falls (I-15 MP 115 to 121), Middleton, Pocatello valley (segments of I-15, I-15B, I-86, US 30 and US 91), Star and Twin Falls (US 93 MP 41 to 53) (IDAPA 39.03.01.305.08). Through trucks follow posted local route signs; local deliveries take the most direct path under federal reasonable-access rules.
• Fine: Hazmat routing and placarding violations are handled as commercial/traffic violations and misdemeanors; dollar amounts vary by court and are not fixed statewide. Oversize-width and time-of-day violations carry separate citations. Confirm current penalties with ITD.

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