Idaho

Idaho interstate GVW limit: 80,000 lbs. State highways allow up to 105,500 lbs with proper axle configuration. Per-axle limits: Single axle 20,000 lbs, Tandem axle 34,000 lbs, Tridem axle 42,000 lbs. Federal bridge formula on interstates; Idaho weight table on state highways allows higher weights with extra axles. Enforcement tolerance: No tolerance on interstates; posted routes enforced strictly.

Height: 14 ft. Width: 8 ft 6 in. Trailer length: 53 ft (semitrailer). Overall combination length: 75 ft combination.

Oversize/overweight permits online through ITD Trucker Services Fees: Single-trip: $26; Annual: $75. Alabama oversize permits are not directly honored in Idaho. You will need to obtain a Idaho-specific permit for oversize/overweight loads. Apply online: https://itd.idaho.gov/trucking/ Enforcement: Ports of entry and roving patrols; fines escalate with overweight amount.

Agricultural: Farm vehicles exempt on state highways during harvest season; agricultural implements exempt. Timber/Forestry: Log trucks allowed up to 105,500 lbs on designated state routes.

Spring breakup restrictions reduce weights by 25-30% on posted routes February-May. Check with the state DOT for current postings and dates before planning your route.

For the most current weight and size regulations, permit applications, and seasonal restriction updates, visit the official Idaho DOT page at https://itd.idaho.gov/trucking/. Contact the Idaho Transportation Department for specific routing questions.