Permits
Colorado oversize permits are valid for five days.
Operating Time
Sunrise to Sunset. Up to 12′ wide, night travel is allowed with proper lighting. Over 12′ wide but not over 14′ wide requires an escort for night running.
Restricted Travel
Curfew times are shown on the addendum that accompanies an oversize permit. Eisenhower Tunnel on I-70: maximum overall height allowed is 13′-11″. Higher loads use US6 to bypass the tunnel. Over 11′ wide permitted loads must pull over and call to get clearance to pass through tunnel, but wider loads can use it. Loads into or out of Denver require a city permit for city streets, but Denver is very slow in turning them around (average 2-3 days).
Legal Dimensions
Length: 57′-4″ trailer & load legal on interstate or designated highways.
Overhang:
4′ front
10′ rear
Over 4′ rear needs lighting for night running.
Width: 8′-6″
Height: 14′-6″ designated highways, 13′ non-designated
Weight:
80,000 Gross on Interstate
85,000 on non-Interstate
Steer – 20,000
Single – 20,000
Tandem – 36,000
Tridem – 54,000
Routine Permit Limits
Length: 130′ (four-lane highways).
Width: 17′
Height: 16′ (Over 14′-6″ requires a survey)
Weight:
Single – 22,000-27,000
Tandem – 42,000-50,000
Tridem – 55,000-65,000
Quad – 60,000-72,000
Note: Maximum permitted weights depend on route classification and axle spacings.
Loads exceeding 17′ wide or 200,000 GVW are Super Loads and require 6-10 days for approval.
Escorts
Length:
Over 85′ on some portions of two and four-lane highways – one escort
Over 110′ on two-lane or over 115′ on four or more lanes – one escort
Overhang: Over 25′ – one escort.
Width: Interstate over 13′ – one rear escort or one flashing yellow light in rear.
Height:
Over 16′ – one escort with high pole
Over 17′-6″ – route survey and utility clearance letters also required
Miscellaneous
Dozer blade can be detached and hauled with the dozer on same trailer if the load would be overweight with or without the blade. Colorado Chain Law: All commercial vehicle truck-tractors operating on I-70 between Dotsero (milepost 133) and Morrison (milepost 259) between September 1st to May 31st must carry sufficient chains to be in compliance with the Colorado chain law. You can be fined for failure to comply. A permit is now available for overweight divisible loads on tractor/trailers with tandem, tridem or quad trailer.
Signs, Flags & Lights
“Oversize Load” signs are required front and rear for all oversize loads. They are not required and should not be used for overweight only loads. Flags are required at all four corners of any extremities for wide and over length loads, and at the end of load projections greater than 4 feet.
For night travel of wide loads, a flashing yellow light mounted on front of the vehicle and two or three mounted to the extreme rear are required. Over length or with rear overhang (over 10′) may run at night with a flashing yellow light mounted to front of vehicle and from one to three cluster lights mounted to overhang (red for rear overhang, yellow for front overhang). For night travel with legal overhang (10′ rear or less) but greater than 4′ rear, a red light or lantern plainly visible for 500 feet is required at the end of load projection.
