Question 1

Do Idaho and Washington require pilot cars at the same width?

Accepted Answer

Idaho requires a pilot car from 12 ft 1 in wide; Washington waits until 14 ft 0 in. A load between those widths needs an escort in Idaho only.

Question 2

Is the legal truck height the same in Idaho and Washington?

Accepted Answer

Both states use the same legal height, 14 ft 0 in.

Question 3

Do I need a separate permit for each state between Idaho and Washington?

Accepted Answer

Yes. Oversize and overweight permits are issued by each state, so a move through both needs a permit from Idaho Transportation Department (Commercial Vehicle Services / Permits4Idaho) and one from WSDOT Commercial Vehicle Services (Permits), each with its own route, hours and escort conditions.

Question 4

Which travel hours apply in Idaho and Washington?

Accepted Answer

Idaho: Loads not over 12 ft wide, 120 ft long and 15 ft high may travel 24 hours, 7 days (black-coded routes and interstate). Larger loads are daylight-only per the ITD pilot/escort map. Loads over 13 ft wide barred 6-9 am and 4-6:30 pm Mon-Fri at listed commuter areas (Boise valley I-84, Coeur d'Alene, Idaho Falls, Twin Falls, etc.). Washington: Daylight is the norm; night movement is allowed only if 'Night movement approved' is stated on the permit (dimension envelope up to 12 ft wide, 14 ft 6 in high, 105 ft long is exempt from the night restriction). No movement when visibility is under 500 ft or in hazardous conditions. Commuter-hour curfews on specified highway sections are published with the permit. The conditions printed on the permit control.

Rule	Idaho	Washington
Legal width	8 ft 6 in	8 ft 6 in
Legal height	14 ft 0 in	14 ft 0 in
Legal length	Single motor vehicle 45 ft; semitrailer 48 ft (53 ft on national network and access routes); truck-tractor with semitrailer and trailer (doubles) 75 ft overall, 61 ft trailers combination (68 ft on national network); 115 ft on designated LCV routes by permit (Idaho Code 49-1010).	Single vehicle 40 ft; tractor-semitrailer with semitrailer up to 53 ft; tractor with two trailers combined trailer length up to 61 ft; truck-and-trailer combination up to 75 ft overall.
Gross weight	80,000 lbs	80,000 lbs
First pilot car at	12 ft 1 in	14 ft 0 in
Second pilot car at	14 ft 1 in	20 ft 0 in
Height pole at	16 ft 0 in	14 ft 6 in
Length escort at	120 ft 0 in	125 ft 0 in
Travel hours	Loads not over 12 ft wide, 120 ft long and 15 ft high may travel 24 hours, 7 days (black-coded routes and interstate). Larger loads are daylight-only per the ITD pilot/escort map. Loads over 13 ft wide barred 6-9 am and 4-6:30 pm Mon-Fri at listed commuter areas (Boise valley I-84, Coeur d'Alene, Idaho Falls, Twin Falls, etc.).	Daylight is the norm; night movement is allowed only if 'Night movement approved' is stated on the permit (dimension envelope up to 12 ft wide, 14 ft 6 in high, 105 ft long is exempt from the night restriction). No movement when visibility is under 500 ft or in hazardous conditions. Commuter-hour curfews on specified highway sections are published with the permit.
Weekends	Red-coded routes: daylight only until 2 pm Friday, no Saturday or Sunday travel, resumes Monday at sunrise. Black-coded and interstate: loads within 12 ft wide / 120 ft long / 15 ft high may travel weekends; larger loads follow the pilot map restrictions.	No weekend restriction stated in WAC 468-38-175; only holidays and published commuter-hour restrictions apply.
Trip permit	$60.00	$25.00
Permit office	Idaho Transportation Department (Commercial Vehicle Services / Permits4Idaho)	360-704-6340 (WSDOT Commercial Vehicle Services (Permits))

Idaho vs Washington Oversize Load Rules

What changes at the Idaho and Washington border

Check one load against both states

Side by side

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Idaho and Washington FAQs