PERMITS:
Wyoming oversize permits are obtained from Ports of Entry by the driver (see phone list at the bottom of this page). 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.
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.
RESTRICTED TRAVEL:
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 a permit if you wish to run on the holiday.
LEGAL DIMENSIONS
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
ROUTINE PERMIT LIMITS
Length: 110′
Width: 18′
Height: 17′
Weight:
Single – 25,000
Tandem – 55,000
Tridem – 65,000
Loads in excess of these dimensions are considered as superloads.
ESCORTS
On Interstate Highways:
Length: At the 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-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)
SIGNS, FLAGS & LIGHTS: 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.
SEASONAL LOAD RESTRICTIONS: No specific annual restrictions, but they may be imposed as necessary during the spring thaw.
