Idaho is a critical freight corridor state connecting the Pacific Northwest to the Mountain West and beyond. I-84 runs east-west through southern Idaho, I-86 connects to I-15 at Pocatello, and I-90 crosses the northern panhandle — together forming the backbone of Idaho commercial trucking. The Idaho Transportation Department (ITD) manages permits, registration, and infrastructure, while the Idaho State Police Commercial Vehicle Safety Division handles roadside enforcement. Idaho is one of the few western states that permits Longer Combination Vehicles (LCVs), including triple trailers, on designated corridors including I-15, I-84, I-86, and I-90, giving carriers significant efficiency advantages on those routes. Agriculture drives a large share of freight: potatoes, dairy, wheat, barley, and sugar beets all generate substantial seasonal trucking volumes, and the state provides agricultural exemptions for certain intrastate operations. IFTA and IRP administration is handled through the Idaho Transportation Department. Carriers should be aware that mountain passes on I-84 and US-30 can impose seasonal chain requirements and road closures, and that oversize/overweight permits are required for loads exceeding the standard federal envelope.
| GVWR | 80,000 lbs federal interstate standard |
| Single axle | 20,000 lbs |
| Tandem axle | 34,000 lbs |
LCVs on designated corridors (I-15, I-84, I-86, I-90) may operate at higher gross weights under the federal LCV Freeze. Overweight permits are available through ITD for non-standard loads.
State trucking association: Idaho Trucking Association
Yes. Idaho permits Longer Combination Vehicles including triple-trailer combinations on designated Interstate corridors (I-15, I-84, I-86, I-90) under the federal LCV Freeze. Carriers must have proper authorization and operate only on approved routes.
Idaho provides exemptions for certain agricultural vehicles and implements of husbandry operating intrastate. These exemptions can affect registration, permit, and hours-of-service requirements. Carriers should verify current exemption criteria with ITD, as they may vary by vehicle type and commodity.
The Idaho Transportation Department issues oversize/overweight permits through its online permit portal. Single-trip and multi-trip permits are available. Loads exceeding certain dimensions require pilot cars and may require special routing approval.
Idaho enforces seasonal weight and road restrictions in spring when frost thaw weakens roadbeds. Carriers should check ITD postings for active spring weight restriction zones, which typically apply to secondary state highways and county roads rather than Interstates.