Wyoming OSOW permits

Permits are obtained from the Ports of Entry by the driver. The driver must call ahead to the Port/Scale at least one hour prior to arrival and obtain a clearance number. Failure to do this will result in up to a $500 fine and 24-hour shutdown. The permit is usually valid for one day or one trip.

Wyoming permitting system: http://www.dot.state.wy.us/home/trucking_commercial_vehicles/commercial_permits.html


One-half hour before sunrise to one-half hour after sunset, including weekends, plus loads not exceeding 10' wide, and all other dimensions are legal, may travel at night on Interstate highways only with proper lighting.


Holiday travel is usually allowed for loads not requiring escorts, but Ports of Entry are not open, so check with the Port on pre-ordering permit if you wish to run on the holiday.


Width: 8'6”

Height: 14'

Length: 60' semi-trailer and load (including any overhang)

Weight: 80,000 – 117,000 Gross (Federal Bridge Formula applies)

Single – 20,000 Tandem – 36,000 Tridem – 42,000

Divisible Loads Exceeding 80,000:

You can exceed 80,000 gross without a permit on state and Interstate highways as long as you are legal on all axle weights and bridge and you are licensed for at least the amount of your gross weight.


Width: 18'

Height: 17'

Length: 110'

Weight: Single – 25,000 Tandem – 55,000 Tridem – 65,000

Loads in excess of these dimensions are considered as superloads and must go through the Central Office


On Interstate Highways:

Width: Over 14'11" – 1 escort (Additional escorts may be required by the Highway Patrol for extreme widths.)

Height: As determined by WY Highway Patrol (not usually required)

Length: At the discretion of WY Highway Patrol

Overhang: Over 25' rear – 1 escort

On 2-Lane Highways:

Width: Over 13'11" or if load extends past center lane at any time – 2 escorts

Height: As determined by WY Highway Patrol (not usually required)

Length: Over 109' – 2 escorts


All oversize loads/vehicles must display "Oversize Load" on both front and rear. Flags are to be placed on projections extending beyond the sides of the trailer. Over 4' of rear overhang must be flagged (daytime) or lighted at night. Night running, if allowed, requires an amber clearance light on each front corner and red clearance light on each rear corner of the load and a revolving amber light, amber strobe, or two-way flashing amber lights at least 4" in diameter mounted on the vehicle visible to both front and rear.


No specific annual restrictions, but they may be imposed as necessary during the spring thaw.

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