Trucking Regulations in Wyoming
Complete guide to weight limits, speed limits, permits, chain laws, and special rules for commercial truck drivers operating in Wyoming.
Max Gross Weight
117,000 lbs on state routes with permit
Truck Speed Limit
70 mph on interstates
Diesel Tax
$0.24 per gallon diesel + federal
Weight & Size Limits in Wyoming
| Measurement | Limit |
|---|---|
| Max Gross Vehicle Weight | 117,000 lbs on state routes with permit |
| Max Axle Weight | 20,000 lbs single axle, 36,000 lbs tandem |
| Max Trailer Length | 85 ft for doubles, 110 ft for triples on designated routes |
| Max Width | 102 inches |
| Max Height | 14 ft |
Speed Limits for Trucks in Wyoming
Rural Interstate
80 mph (cars), 70 mph trucks
Urban Interstate
55-65 mph
Truck-Specific
70 mph on interstates
Fuel Tax & Tolls in Wyoming
Diesel Fuel Tax
$0.24 per gallon diesel + federal
Toll Roads & Bridges
No toll roads in the state.
Chain Laws & Weather Requirements
Chain carry required October 15 to April 15 on I-80. WYDOT can require chain-up at any time on any highway.
Oversize & Overweight Permits
WYDOT Motor Vehicle Services. Wyoming is very accommodating to oversize loads with permits up to 117,000 lbs. Triple trailers permitted.
Port of Entry & Weigh Stations
Ports of entry on I-25, I-80, I-90. All commercial vehicles must stop. WYDOT commercial vehicle enforcement.
Special Rules for Wyoming
Hazmat Route Restrictions
Hazmat routing through Yellowstone approaches is restricted. Designated routes for oil and gas industry hazmat in the Powder River Basin. I-80 hazmat routing accounts for wind restrictions.
Rest Area & Parking Rules
Rest areas allow overnight parking. Spacing on I-80 can be 50+ miles. Chain-up areas double as parking during storms. No anti-idling law.
DOT Inspection Frequency
Moderate. WYDOT commercial vehicle enforcement focuses on I-80 (wind compliance and chain compliance) and ports of entry.
Looking for Trucking Jobs in Wyoming?
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Frequently Asked Questions About Wyoming Trucking Regulations
How bad is the wind on I-80 in Wyoming?
I-80 across southern Wyoming is one of the windiest interstate corridors in the US. Wind gusts of 60-80+ mph are not uncommon during winter storms. High-profile vehicles (empty trailers, flatbeds) are frequently prohibited. I-80 closures due to wind can last hours or days. Electronic message boards warn of wind restrictions.
What is the maximum truck weight in Wyoming?
Wyoming allows up to 117,000 lbs on designated state routes with proper permits and multi-axle configurations. Triple trailers are also permitted on designated routes. Interstate highways follow the federal 80,000 lbs limit.
Are chains required on I-80 in Wyoming?
Wyoming requires chain carry from October 15 through April 15 on I-80. WYDOT can require chain-up at any time on any state highway. Chain-up areas on I-80 are well-marked. Fines for not carrying chains during the mandatory period are significant, and causing a highway closure due to inadequate traction can result in penalties over $2,500.
What is the truck speed limit in Wyoming?
Wyoming has a 70 mph truck speed limit on rural interstates while passenger vehicles can travel 80 mph. The 10 mph differential is enforced. Wind conditions often reduce safe operating speeds well below posted limits.
How far apart are services on Wyoming highways?
Services on I-80, I-25, and US-20/26 can be 50-100+ miles apart. Some stretches of I-80 in the Red Desert area have no services for 75+ miles. Drivers should fill up at every opportunity, carry extra water, and ensure their vehicle is in good mechanical condition before crossing Wyoming.