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Idaho Oversize Permit Phone Number: (270)908-9656
Idaho Oversize/Overweight Permits Rules and Regulations
Idaho Oversize Overweight permits Validity: Oversize permits issued in Idaho remain valid for a total of Five consecutive days. Drivers are required to secure the permit before entering the state.
Idaho Traveling Time with Oversize Load: Travel is typically permitted starting 30 minutes before sunrise and ending 30 minutes after sunset, including weekends on most highways. Loads as wide as 10 feet, 110 feet long, or 14 feet 6 inches high may qualify for 24/7 movement depending on the road and lighting arrangements. Weekend travel during daylight hours is typically permitted on most roads.
Idaho Oversize Permits Load Restricted Travel: For loads wider than 13 feet, movement is restricted in cities such as Boise, Caldwell, Coeur d’Alene, Idaho Falls, Twin Falls, Lewiston, and Chubbuck during peak hours: 6:30 AM–8:30 AM, 11:30 AM–1:30 PM, and 4:00 PM–6:00 PM. Holiday travel could be restricted based on the load’s specifications.
Idaho Holiday Restriction: Unless otherwise stated in Idaho oversize permits movement of oversize loads is not allowed on the following holidays: New Year’s Day, Memorial Day, Independence Day, Labor Day, Thanksgiving Day, and Christmas Day.
Red-Coded Routes: Travel is restricted after 2:00 PM on the day before a holiday or holiday weekend. Movement can resume at daybreak on the day following the holiday or weekend.
Black-Coded Routes and Interstates: For loads over 10′ wide, 100′ long, or over 15′ in height, travel is prohibited after 4:00 PM on the day before a holiday. Travel may resume at dawn the day after the holiday.
Idaho Road/Bridge Restriction with Oversize Load:
Idaho follows the Federal Bridge Formula and imposes specific bridge limits. Road-related oversize restrictions include, but are not limited to:
- Passing through construction zones
- Ignoring warning signals in work zones
- Failing to yield to emergency vehicles or law enforcement
Note: All towed or self-driven vehicles must follow the posted weight limits for bridges.
Oversize load Seasonal Restriction in Idaho:
provinces. Seasonal restrictions could be specified in oversize permits depending on road and load conditions.
The state may enforce restrictions on vehicle size, weight, and speed during periods of potential road damage due to weather. To ensure safety, loads are classified under four categories:
- Legal weight
- 16,000 lbs on any axle
- 14,000 lbs on any axle
- 12,000 lbs on any axle
On two-lane highways, spring breakup restrictions may limit permit width to 12′ 6″ during designated periods.
During spring breakup season, expect:
- Speed limits of 30 MPH
- Minimum tire width of 10 inches
- Maximum axle weight of 10,000 lbs for two-tire single axles
Maximum axle weight of 14,000 lbs for single axles with four or more tires.
Tire Chain Laws (Truck Trailer) for Oversize Load in Idaho:
Tire Chain Laws (Truck Trailer) for Oversize Load in Idaho: The Idaho Transportation Department may declare driving unsafe on certain passes, including Lookout Pass and Fourth of July Pass on I-90, and Lolo Pass on Highway 12. In such cases, chains are required on at least one tire of each drive axle, and on at least one axle near or on the rear of the vehicle.
Idaho Legal Dimensions/Size Limit
Idaho Legal Length:
Length:
- A 53-foot semi-trailer is accepted on the National Network (N.N.).
- A 48-foot trailer is the maximum length permitted on roads not part of the National Network (non-designated routes).
Note: Several Idaho two-lane highways are considered non-designated, such as US-12 (excluding the stretch between Lewiston and Spalding), US-93 (from Salmon to Challis), and US-95 (between Council and Grangeville).
- Divisible loads exceeding 48 feet in trailer length must secure an Annual Extra Length Permit, with a maximum tractor-trailer off-track of 5.50 feet (or 3.00 feet on select mountainous routes).
- Non-divisible loads can be transported under a single or annual permit without off-track limitations.
Overhang Limits:
- Front: Up to 4 feet
- Rear: Up to 15 feet
Idaho Wide Load Limit: The standard legal width is 8 feet 6 inches.
Idaho Legal Height: Maximum allowed height is 14 feet.
Idaho Legal Weight Limit: Gross Vehicle Weight (GVW) is 80,000 pounds
- Steer Axle: 600 pounds per inch of tire tread width (for example, 13,200 pounds with 11-inch tires)
- Single Axle: Up to 20,000 pounds
- Tandem Axle: Up to 34,000 pounds
- Tridem Axle: Based on axle spacing
Divisible Loads Over 80,000 lbs:
On Idaho state highways, divisible loads may exceed 80,000 pounds without a special permit as long as axle weights are compliant and the vehicle is registered for the full gross weight. However, traveling on the Interstate will require an Annual Excess Weight Permit.
Maximum Load Dimensions with permits in Idaho
Limits vary depending on the specific route, distance, and any bridge crossings involved
Length: Up to 110 feet
Width: Up to 16 feet
Idaho Wide Load Requirements
- Permit Required: A permit is mandatory for any load that exceeds 8 feet 6 inches in width.
- Escort Vehicles (based on route color):
Red Routes:
8′10″–10′ wide: 1 front escort
10′1″–12′6″ wide: 1 front + 1 rear escort
Black Routes:
Loads from 12′1″ to 14′ wide must have one escort in front and one at the rear
White Routes:
15′1″–18′ wide: 1 rear escort
Idaho Wide Load Restrictions
- Holiday Restrictions:
No travel on major holidays (New Year’s, Memorial Day, Independence Day, Labor Day, Thanksgiving, Christmas).
Red Routes: No travel after 2 p.m. the day before holidays/weekends; resume at dawn after.
Black/Interstate Routes: For loads over 10′ wideno travel after 4 p.m. before holidays; resume at dawn after. - Travel Times: Daily travel allowed from 30 minutes after sunrise to 30 minutes after sunset. Local city restrictions may apply.
- Road/Bridge Rules:
Must follow Federal Bridge Formula and posted limits.
Obey work zone warnings and yield to emergency vehicles. - Seasonal Restrictions:
Spring breakup may limit width to 12′6″ on two-lane roads.
Height: Maximum 15 feet 6 inches
Weight Limits (based on route type):
- Steer Axle: 600 pounds per inch of tire tread (up to 13,200 pounds for 11-inch tires)
- Single Axle: Between 22,000 and 33,000 pounds
- Tandem Axle: Between 38,500 and 56,000 pounds
- Tridem Axle: Between 48,000 and 70,500 pounds
Note: Maximum group weights vary based on route classification. Interstate highways allow higher limits.
Loads going beyond permitted weights or dimensions fall under the Super Load classification .
What Are The Requirements For a Pilot Car In Idaho
For 2-Lane Roads:
- Length: Over 100 feet – 1 escort vehicle
- Rear Overhang: Over 25 feet – 1 escort vehicle
- Width:
Over 12 feet – 1 escort
Over 14 feet – 2 escorts
Over 16 feet – may require 3 escorts - Height: Over 16 feet required one escort
- Length: For loads over 120 feet long, one escort vehicle is required
- Rear Overhang: Over 25 feet – 1 escort
- Width:
Over 15 feet – 1 escort
Over 16 feet – possibly 2 or 3 escorts - Height: Over 16 feet required one escort
Signage, Flashing Amber lights and flags Requirements and Idaho Additional Information
Permit-specific requirements for signs, flags, and lighting are detailed on Idaho Oversize permits. “Oversize Load” signs are required on all overwidth loads. Red or fluorescent orange flags must be placed at each corner and extremity of overwidth loads, as well as at any rear overhang exceeding 4 feet. Overweight-only hauls are typically exempt from signage or flagging.
If a vehicle exceeds legal axle weight, all lift axles must be lowered to the ground. Items like blades and buckets may be transported on the same load if removed, subject to route and situation approval. Each application is evaluated on a case-by-case basis by the relevant authorities.
Idaho Oversize Permits fee:
- Oversize Permits
Single Trip Oversize Permit
Standard Cost: $28
High-Dimension Loads (exceeding any of the following):
Width: 16 feet
Height: 16 feet
Length: 110 feet
Cost for High-Dimension Loads: $71
Validity: One trip from origin to destination, as specified on the permit. A return trip requires a separate permit.
Annual Oversize Permit
Standard Cost: $43
Permitted Dimensions:
Width: Up to 16 feet
Height: Up to 15 feet 6 inches
Length: Up to 110 feet
Gross Vehicle Weight (GVW): Up to 256,000 pounds
Note: No axle may exceed 20,000 pounds.
Red-Coded Routes (Limited to 12’6” wide):
Cost: $128
Requirement: Submit quarterly mileage reports. - Overweight Permits
Single Trip Overweight Permit
Cost: $71
Eligibility: Required when a vehicle/load exceeds the legal weight limits.
Annual Overweight Permit
Cost: $128
Use: Applies to loads exceeding Idaho’s maximum legal gross weight. - Combined Oversize & Overweight Permits
Single Trip Combination Permit
Cost: $103
Use: For vehicles exceeding:
Width: 16 feet
Height: 16 feet
Length: 110 feet
Annual Combination Permit
Cost: $128
Includes: Oversize and overweight privileges within the permitted limits. - Specialty and Other Permits
Combination Permit for Idaho-Registered Power Units
Cost: $120
Use: For power units registered in Idaho towing multiple non-registered trailers.
Temporary Trip Permit
Cost: $50
Validity: 5 days
Use: For non-IRP registered vehicles traveling in Idaho.
Temporary Fuel Permit
Cost: $60
Validity: 5 days
Use: For vehicles not registered under IFTA (Interstate Fuel Tax Agreement) using diesel, propane, or natural gas and weighing over 26,000 pounds. - Idaho Trip Permits
IRP (International Registration Plan) Trip Permit:
Cost: $60
Validity: 120 hours (5 days)
Use: For out-of-state carriers operating vehicles not registered under IRP. - Idaho Fuel Permits
IFTA (International Fuel Tax Agreement) Temporary Permit:
Cost: $60
Validity: 120 hours (5 days)
Requirements:
Vehicle must weigh over 26,000 pounds
Must use diesel, natural gas, or propane fuel
Use: For non-IFTA registered carriers operating temporarily in Idaho. - Specialty Permits
These permits are based on specific operational needs or special load characteristics:
Amber Light Permit
Requirement:
Escort vehicles must be equipped with a roof-mounted amber warning light when accompanying oversize loads.
Loading Zone Permit
Use:
Authorizes the use of commercial loading zones by non-commercial delivery vehicles under specific conditions.
Other Specialty Permits
Requirement:
May be needed depending on the vehicle/load configuration.
Contact the Idaho Special Permits Office in advance to verify if a specialty permit is needed or to declare intent to apply. - Processing & Application Fees
In addition to permit costs, an application or handling fee may apply for processing any type of permit request.
Idaho Oversize/Overweight Load Fines
Penalties for transporting oversize or overweight loads in Idaho are determined based on how much the vehicle exceeds the state’s legal weight limits.
General Fine Structure
- Minimum Fine: $300
- Maximum Fine: Over $2,500
- Criminal Penalties: In more serious or repeated violations, offenders may face up to 6 months in county jail.
- Repeat Offenders: Multiple violations within a 12-month period may result in significantly higher fines and potential imprisonment.
Graduated Fine Schedule
Fines increase according to the number of pounds over the legal weight limit, as follows:
- Up to 1,000 lbs overweight – $5.00
- 1,001 to 2,000 lbs overweight – $15.00
- 2,001 to 4,000 lbs overweight – $25.00
- 4,001 to 15,000 lbs overweight – $25.00 plus an additional $0.13 per pound beyond 4,000 lbs
- Over 20,000 lbs overweight – the fee is $2,500.00 plus $0.30 per extra pound
FAQ’s
You can contact at (270)908-9656 Express Heavy Haul for Idaho Oversize Permits.
To get a 72-hour trip permit for an unregistered commercial vehicle traveling in Idaho, visit call (270)908-9656.
You can request an Idaho trip permit online through our website or by calling us at (270)908-9656.
Trip permits are necessary for commercial vehicles that are not registered in Idaho, while fuel permits are mandatory for carriers operating without a valid fuel tax license.
For Idaho Oversize Permits, call us directly at (270)908-9656.
Yes, unregistered commercial vehicles are required to have a trip permit to operate legally in Idaho.
The maximum legal width for vehicles traveling without a special permit in Idaho is 8 feet 6 inches.
Generally, oversize loads in Idaho may only travel during daylight hours, starting 30 minutes before sunrise and ending 30 minutes after sunset.
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Get Your Idaho Oversize Permit - Trucking Permits
If your vehicle exceeds those numbers, it’s likely overweight or hauling an oversize load. Let Express Heavyhaul Trucking Permits help get you your Idaho oversize or overweight permit. State Direct. 24/7 Live Service. Order Online Today. Trip & Fuel Combo Permits. Types: Oversize, Overweight, Trip.
