Department of Transportation
WYDOT
Wyoming • United States of America
The Wyoming Department of Transportation (WYDOT) manages over 6,800 miles of state highways across the tenth largest state by area, serving one of the nation's most challenging freight environments due to extreme weather, high winds, and long distances between services. I-80 through Wyoming is one of the most notoriously difficult freight corridors in the US, with frequent chain control requirements and road closures due to blizzards and high winds. WYDOT administers commercial vehicle permits, enforces chain and traction laws critical for truckers, and operates WYOroad for statewide road conditions. The department plays an essential safety role in managing I-80 freight traffic through Laramie and Cheyenne.
| Official Website | https://www.dot.state.wy.us/ |
|---|---|
| Data API | https://www.wyoroad.info/ |
| Founded | 1917 |
| Headquarters | Cheyenne |
Available Data
Social Media
- @WYDOT_I80 — Wyoming DOT
Wyoming Trucking Regulations
Size & weight limits, OS/OW permits, and seasonal restrictions for commercial vehicles
Weight Limits
| Category | Limit |
|---|---|
| Max Gross Vehicle Weight | 80000 lbs |
| Single Axle | 20000 lbs |
| Tandem Axle | 34000 lbs |
Dimensional Limits
| Category | Limit |
|---|---|
| Max Height | 14 ft |
| Max Width | 8.5 ft |
| Max Length (Single Unit) | 40 ft |
| Max Length (Combination) | 81 ft |
OS/OW Permits
Seasonal Restrictions Nov, Dec, Jan, Feb, Mar
Wyoming's I-80 corridor, particularly the Elk Mountain section (US-30 alignment near Laramie), is one of the most dangerous freight segments in the US due to high winds, blowing snow, and ice. The Wyoming DOT regularly closes I-80 between Rawlins and Laramie during wind and blizzard events. Chain requirements apply on I-80 and other passes from approximately November through March.
Weigh Station Bypass
24¢/gal
Member
Special Exemptions
Notable Rules
Wyoming allows longer combination vehicles (LCVs) up to 81 ft on its Interstate system — among the longest permitted in the US. Coal, trona (sodium carbonate), and oil/gas industries generate heavy haul throughout the state. I-80 Elk Mountain corridor is notorious for truck rollovers due to crosswinds exceeding 100 mph during storms — WYDOT issues commercial vehicle travel restrictions. I-25 and US-26 are additional primary corridors.