Permits
Wyoming oversize permits are obtained from Ports of Entry by the driver (see phone list at bottom of this page). 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.

Operating Time
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.

Restrictions
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.

SEASONAL LOAD RESTRICTIONS: No specific annual restrictions, but they may be imposed as necessary during spring thaw.

Legal Dimensions
The vehicle must have the following characteristics:

Length: 60′ semi-trailer and load (including any overhang)
Width: 8’6″
Height: 14′
Weight: 80,000 – 117,000 Gross (Federal Bridge Formula applies) Single – 20,000 Tandem – 36,000 Tridem – 42,000 (8’1″ to 8’5″ of spacing) 36,000 with 8′; 42,500 pounds with greater than 8’6″ spacings; and 43,500 with greater than 10′ of spacings
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.

Routine Wyoming Oversize Permit Limits
Length: 110′
Width: 18′
Height: 17′
Weight: Single – 25,000 Tandem – 55,000 Tridem – 65,000 Quad – 74,000
Register for up to 117,000 pounds to permit for that much or more

Loads in excess of these dimensions are considered as superloads.

Escorts
On Interstate Highways:

Length: At discretion of WY Highway Patrol
Overhang: Over 25′ rear – 1 escort
Width: Over 14′ – 1 escort (Additional escorts may be required by the Highway Patrol for extreme widths.)
Height: As determined by WY Highway Patrol (not usually required)
On 2-nd Lane Highways:

Length: Over 109′ – 2 escorts
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)

Security Measures
All oversize loads/vehicles must display Oversize Load on both front and rear. Flags are to be placed on projections extending beyond sides of 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.