Idaho oversize load rules
Legal limits, pilot car requirements, travel restrictions, superload thresholds and permit fees for oversize and overweight loads in Idaho.
Legal limits without a permit
| Width | 8′6″ (Idaho Code 49-1010) |
|---|---|
| Height | 14′ |
| Length | 45′ single vehicle · 48′ trailer or semitrailer · 75′ overall · 4′ front / 10′ rear overhang |
| Weight | 80,000 lb on Interstate; up to 105,500 lb on other routes under Idaho Code 49-1001 (129,000 lb on designated routes by permit) |
At a glance
| Escorts | 4 escort rules, starting at 8′6″ wide |
|---|---|
| Superload | 3 review triggers (height, length, width) |
| Travel | 4 restrictions (curfews, night, holidays) |
| Fees | 4 published fee lines |
Escort (pilot car) requirements
- 4 width, height and length thresholds with the escort count for each
- Overhang and route-type conditions
Travel restrictions
- 4 restrictions: curfews, night travel, weekends and holidays
- Which ones apply to a given load size
Superloads
- Exact thresholds and what the state requires past them
- Lead times, route surveys and police escort conditions
Permit fees
- 4 published fee lines with links to the fee schedule
- Validity periods and add-on charges
Common questions
Does Idaho have a superload threshold?
Not by that name. Additional ITD approval is needed over 16′ wide on red/black routes, 18′ wide on Interstates, 16′ high, 120′ long on non-Interstate routes or 150′ on Interstates.
Can oversize loads travel 24 hours in Idaho?
On Interstates and black routes up to 12′ wide, 15′ high and 120′ long. Red routes are daylight only with no weekend travel.
How much is an Idaho oversize permit?
$30 single-trip oversize, $33 single-trip overweight, $45 annual oversize, $128 annual overweight/oversize.
Sources
- ITD Rules Governing Overlegal Permits (IDAPA 39.03) consolidated text
- Idaho Code 49-1010, size of vehicles and loads
- Idaho Code Title 49 Chapter 10 (49-1001 weight limits)
Planning reference. Permits carry their own conditions, and city and county roads have separate rules. Confirm with the Idaho Transportation Department, Commercial Vehicle Services / Overlegal Permits (Boise) before moving a load. Found an error? Report it.
Other states: Alabama · Arizona · Arkansas · California · Colorado · Connecticut · Delaware · Florida · Georgia · Illinois · Indiana · Iowa · Kansas · Kentucky · Louisiana · Maine · Maryland · Massachusetts · Michigan · Minnesota · Mississippi · Missouri · Montana · Nebraska · Nevada · New Hampshire · New Jersey · New Mexico · New York · North Carolina · North Dakota · Ohio · Oklahoma · Oregon · Pennsylvania · Rhode Island · South Carolina · South Dakota · Tennessee · Texas · Utah · Vermont · Virginia · Washington · West Virginia · Wisconsin · Wyoming