Idaho Oversize & Overweight Permits

When Idaho needs a permit

Idaho's legal line is 8'6" wide, 14' high, 80,000 lb (Idaho Code 49-1004). Cross it and you buy a permit through ITD, usually same day. On two-lane roads a pilot car starts at 12' wide and a second at 14'; over 16' high adds a pole car, and over 15' wide brings an escort on the Interstate. Run sunrise to sunset. Compact loads under 10' wide move around the clock. No hauling on major holidays.

Thresholds, escorts, and curfews

• Legal max before a permit: Permit needed over 8'6" wide, 14' high, 80,000 lb, or past legal length (53' trailer / 75' combination). Under all of those you run on your own authority, no permit.
• Escort / pilot car: On two-lane roads one pilot car over 12' wide, two over 14', and up to three over 16'; a height pole car over 16' high; one escort past 100' long or with rear overhang over 25'. On the Interstate one escort over 15' wide and a second over 16'. Confirm every trigger on the permit.
• Superload: Past the routine permit band (about 16' wide, 15'6" high, 110' long) or on a heavy non-divisible load needing bridge analysis, ITD moves you to a superload/engineering review with a route survey and up to roughly 5 business days of lead time.
• Travel curfew: Oversize runs sunrise to sunset. A compact load (about 10' wide or less, 14'6" high, up to 110' long) can move 24/7 with proper lighting on most routes. No travel on major holidays. In listed cities, loads over 13' wide are held during the morning, midday, and evening rush windows.
• Permit fee: Single-trip over-legal permits run roughly $16 to $60. An annual non-reducible oversize/overweight permit is about $128 plus quarterly mileage reports; reducible annual oversize permits are priced separately.

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