Permits valid for seven days. A permit is normally obtained prior to entering the state. Permits can also be obtained at Ports of Entry. (You need proof of insurance in the vehicle if you buy a permit at a POE).
Kansas Permitting System: https://www.k-trips.com/
Contact phone number: 1-785-368-6501
One-half hour before sunrise to one-half hour after sunset, seven days a week and holidays. Overweight only with legal dimensions can have night travel, provided a permit is obtained to authorize it.
Width up to 12'6 allowed to travel without an escort, 24 hours a day seven days a week (must have proper lighting traveling nights). Over 12'6 wide up to 14' wide can travel daytime without an escort. Maximum width is 16', 125' long. The maximum height is 14' without special approval from a Turnpike Highway Patrol Officer. Maximum weights: 20,000 single, 34,000 tandem, 42,000 triple, 50,000 quad. Maximum gross weight 120,000. Turnpike phone: (316) 682-4537.
Length: 59'6" trailer, 85' overall for tractor-trailer combination
Overhang: 3' front, 4' rear.
Weight: 80,000 Gross on Interstate & Designated routes; 85,500 on other roads (must be registered for 85,500)
Single – 20,000 Tandem – 34,000 Tridem – 42,000
ROUTINE PERMIT LIMITS:
Height: 18' (Depends on clearances. Over 17' high requires notification of all appropriate utilities before making the move).
Weight: Single – 20,000* Tandem – 45,000 *(KS counts 10'2" spread as a tandem)
Tridem – 60,000 Quad – 65,000
Loads exceeding these dimensions or over 150,000 pounds GVW are considered as Super Loads.
Loads in excess of 80,000 GVW, the unit must be registered for 85,500.
Width: Over 16'6" or when transporting large structures on 4-lane highways – 2 escorts;
Over 14' on highways less than 4 lanes – 2 escorts, or "Except for superloads and large structures, the rear escort may be eliminated if a warning light is attached to the top of the towing vehicle and to the rear of the load and is mounted no less than two feet or more than eight feet above the surface of the road."
Height: Over 18' – 1 escort with a height pole. Over 17' high requires notification of all appropriate utilities before making the move.
Poles, beams, steel pipes, and construction steel loads may be up to 85' long overall (vehicle and load) without a permit as long as the trailer does not exceed 59'6" (daylight travel only), and if other dimensions are legal.
SIGNS, FLAGS & LIGHTS:
"Oversize Load" signs are required for all loads moving under a permit. Red flags must be attached to each side of the widest part of the wide load, and to the rear of all overlength loads. If the overhang is over legal limits, the end of the overhanging objects must be flagged, and “a lamp shall be placed at the end of the load to make the overhang more visible during periods of hazy daylight.” Overweight only loads need "Oversize Load" signs when running in daylight, but they must be taken off if running at night.