Idaho Trucking Regulations

Idaho follows the federal 80,000 lbs GVW limit on interstate highways but allows up to 105,500 lbs on designated state highways with proper permits and axle configurations. The Idaho Transportation Department (ITD) issues oversize/overweight permits through the Permits Unit. Single-trip permits start at $36. Idaho's 129,000-lb permit program allows heavy hauling on approved routes with specific multi-axle configurations. ITD operates 8 permanent ports of entry (weigh stations) along I-84, I-86, I-90, I-15, and US-93/95. Overweight fines start at $75 for the first 2,000 lbs and escalate to $0.06/lb for amounts over 6,000 lbs. The state enforces spring breakup weight restrictions (typically March-May) on state and local roads when freeze-thaw cycles weaken road surfaces.

Idaho's agricultural industry heavily influences trucking regulations. The state provides generous agricultural exemptions from HOS and CDL requirements. Farm vehicles operating within 150 air-miles of the farm during planting and harvest seasons are exempt from CDL requirements. Idaho extends the harvest exemption window beyond federal minimums, typically running April through November depending on the crop. Potato harvest (September-November) and sugar beet harvest (October-November) are the peak agricultural trucking periods in southern Idaho. Hay and grain harvest in central Idaho runs June through September. ITD issues agricultural overweight permits during harvest seasons allowing loads up to 105,500 lbs on additional routes. These exemptions help Idaho's agricultural economy but carriers should verify specific exemption dates annually through ITD.

Idaho requires intrastate carriers to register with the Idaho Transportation Department. The state follows federal HOS, ELD, and safety regulations without significant state-specific additions. Idaho participates in IFTA and IRP. The state enforces chain requirements on mountain passes — chains or traction devices are required on I-84 over the Blue Mountains, US-12 over Lolo Pass, and I-90 over the Fourth of July Pass when conditions warrant. Idaho State Police Commercial Vehicle Safety Program conducts approximately 20,000 inspections annually. The state has specific regulations for logging trucks, which are common in northern Idaho — they may operate under state-specific weight provisions on designated timber haul routes.