Permits by state · Pacific Northwest

Idaho Oversize Permits, Pilot Cars & Travel Times

ITD rules for overlegal loads: legal limits, annual and single-trip permits, escort rules, commuter windows and holiday restrictions.

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Last verified: Oct 15, 2026 against official state sources.

This is a summary, not legal advice, and permit rules change. Confirm current conditions with the issuing agency, or let us handle it: every load we book is permitted and routed for you.

The numbers

Idaho legal limits (no permit)

Dimension	Legal limit
Width	8 ft 6 in
Height	14 ft
Length / weight	Per Idaho Code §49-1010 and the weight statutes. Varies by configuration and route.

Width and height are from Idaho Code §49-1010 and ITD permit documentation.

Sources: Idaho Code §49-1010; ITD Permit Types (PDF). Checked Oct 15, 2026.

Permits

ITD overlegal permits

Idaho Code §49-1004 authorizes ITD to issue overlegal permits. Permits are issued online through ITRPS (permits4idaho.com).

Permit	What it covers
Oversize (annual / single / round trip)	Non-divisible loads over legal size. Annual permits are limited to 12 ft 6 in wide on red-coded routes and 16 ft on black-coded and Interstate routes, up to 15 ft 6 in high and 110 ft long. Single-trip permits can exceed these.
Excess Height (annual)	Loads over 14 ft but not over 14 ft 9 in, on designated highways (the hauling vehicle itself must not exceed 14 ft)
Overweight / oversize	Annual or single-trip for non-divisible overweight loads

Sources: ITD: Permit Types (PDF); IDAPA 39.03.01 Rules Governing Special Permits. Checked Oct 15, 2026.

Pilot cars

Escort requirements

Idaho ties pilot car requirements to load size and route color on ITD's Pilot/Escort Vehicle Travel Requirements and Vertical Clearance of Structures map. Single-trip permits list escorts on the permit itself.

Pilot vehicles are supplied by the permittee: a car or truck no heavier than 16,000 lb, and not towing a trailer.
Loads over 16 ft high need a lead pilot with a non-metallic height pole.
"OVERSIZE LOAD" sign: 12 in × 5 ft, black 8 in letters on yellow.

The width thresholds for each route color come from ITD's map, and we haven't summarized them here yet. See the map, or run your load through our checker.

Sources: IDAPA 39.03.01.306 Pilot/Escort Vehicles; ITD Pilot/Escort & Vertical Clearance map (PDF). Checked Oct 15, 2026.

When you can roll

Travel times, commuter limits and holidays

Commuter restrictions: loads over 13 ft wide can't move during heavy commuter traffic, 6–9 a.m. and 4–6:30 p.m. local time, Mon–Fri, near the listed cities and mileposts, unless the permit says otherwise.
Weekends and holidays: on red-coded routes, travel stops at 2 p.m. Friday or the day before a holiday. Interstate and black-route allowances depend on load size.
Designated holidays: New Year's, Memorial Day, Independence Day, Labor Day, Thanksgiving (Thu, Nov 26, 2026) and Christmas.

Sources: IDAPA 39.03.01 (PDF); ITD Pilot/Escort & Travel map (PDF). Checked Oct 15, 2026.

Permit office

ITD Overlegal Permit Office

Phone 208-872-3163 (option 2) or 1-800-662-7133 · Permits@itd.idaho.gov · permits4idaho.com

Hauling into Boise, Treasure Valley or across I-84? Check your load or call (310) 989-6530.

Quick answers

Idaho oversize permit FAQ

What is the legal width in Idaho?

The legal width in Idaho is 8 ft 6 in without a permit.

What is the legal height in Idaho?

The legal height in Idaho is 14 ft without a permit.

How do I get an Idaho oversize permit?

ITD issues overlegal permits online through ITRPS at permits4idaho.com.

When do I need a pilot car in Idaho?

Idaho ties pilot cars to load size and route color on the ITD map, and loads over 16 ft high need a lead pilot with a non-metallic height pole.

How do I contact the ITD permit office?

Call 208-872-3163 (option 2) or 1-800-662-7133.

Answers summarize the sourced sections above. Last verified Oct 15, 2026.

Keep reading

Shipping in Idaho?

For lanes, industries and how we plan Idaho moves, see Heavy Haul Trucking in Idaho. For cross-state answers on pilot cars, legal width and height, superloads and holiday rules, see the Heavy Haul FAQ.

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Moving equipment into or across Idaho?

Tell me what it is and where it needs to go. I'll get back to you the same day, with CRST's asset-based network behind every quote.
Call (310) 989-6530 · Email Andrew@vectorlogisticsllc.com

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