Kansas Oversize Load Permits, Regulations & Axle Rules

Kansas draws a clean distinction between oversize and overweight moves, and the split has real scheduling implications.

Any load that exceeds the legal width (8'6") or legal length for its vehicle type is confined to daylight: the permit prohibits operation from 30 minutes after sunset until 30 minutes before sunrise. That window is the same seven days a week; Kansas sources identify no separate Saturday lockout or Sunday ban for oversize moves in the statutory text. Oversize loads also require a minimum half-mile of forward visibility and may not move when highway surfaces carry ice, snow pack, or drifting snow. Those conditions stop the clock regardless of the hour.

A pure overweight move (one that exceeds the legal weight scale but stays within legal width and length) gets a different rule: 24-hour operation is permitted. The ice and snow restriction still applies, but there is no daylight limitation. A carrier hauling legal-size but heavy freight in Kansas can plan around the clock, which is unusual enough to note during route planning.

Kansas sources contain no published schedule of holiday blackouts or weekend travel bans for permitted moves, and no metro or rush-hour curfews have been identified for Kansas cities. All permits are issued through K-TRIPS (the Kansas Truck Routing and Intelligent Permitting System), accessible online or by phone at 785-368-6501. Permits are not available at weigh stations. No permit authorizes continuous 24-hour oversize movement; only overweight-only loads get that flexibility.

Several commodity types move under distinct Kansas rules, and the differences are significant enough to change what permit a carrier needs.

Bales of hay get the most specialized treatment. On non-interstate, non-national-network highways, hay bales may be loaded up to 12 feet wide and cylindrical bales may reach 14'6" in height without a permit at all, provided the vehicle carries an "OVERSIZE LOAD" banner (minimum 7 feet long, 18 inches high, 10-inch letters) and red flags at all four corners of the load, and moves in daylight. Once the route touches the national highway network, a permit is required, and the load must stay within 12 feet wide, legal height, and legal weight. A five-year permit for non-interstate hay movement is available for $25. Farm vehicles registered under the farm truck statutes may haul bales up to 12 feet wide on non-interstate state highways without a permit, subject to the same daylight and signing requirements.

Combine headers get limited width relief (two headers may be loaded together on a vehicle that exceeds legal width under rules the Secretary of Transportation adopts), but they are prohibited from the interstate system. The exception is the custom combine operator permit (May 1 through November 15), which allows two headers on designated interstate highways so long as the vehicle plus load stays within 14 feet wide, moves daylight only, and is not overweight. That permit costs $10 per power unit.

Poles, pipe, machinery, and other structural objects that cannot readily be dismembered are exempt from the trailer and semitrailer length limits during daytime moves. If the total combination length exceeds 85 feet, a special permit is required. Nighttime movement of these loads is only allowed for public utility emergency repairs or under a special permit that specifically authorizes it, and clearance lamps and marker lamps on both sides and at the extreme ends of any projecting load are required in that case.

Farm equipment (tractors, combines, fertilizer dispensers, and general farm machinery) is exempt from the oversize permit requirement on non-interstate highways. Farm tractors and fertilizer dispensing machines are not allowed on the interstate at all; other farm equipment requires a permit on the interstate. Implement dealers may operate under an annual permit covering their fleet.

Annual and blanket commodity permits are not covered here; those are handled separately.

Kansas maintains two parallel elevated permit categories with distinct triggers: the Superload and the Large Structure. Each carries a $200 single-trip permit fee rather than the standard $40.

A Large Structure is a load that exceeds either 16'6" in width or 18 feet in height; this is a dimensional category with no weight component. A Superload is a weight-based category: it applies when gross vehicle weight exceeds 150,000 lbs or when any axle group exceeds the weight limitations in the state's axle weight table. There is no length trigger for either category.

The two tiers are independent. A very wide load that does not cross the weight threshold is a Large Structure, not a Superload. A very heavy load that stays within 16'6" wide and 18 feet tall is a Superload, not a Large Structure. A load that crosses both sets of thresholds needs both classifications addressed.

Kansas sources do not publish a fixed advance filing deadline for Large Structure or Superload permits. Because both categories require KDOT review through K-TRIPS rather than automated issuance, carriers should plan for additional lead time beyond a standard single-trip permit. Both categories also require the same escort configuration, at minimum one front and one rear escort vehicle, and the permit may require the Superload to slow at bridges, in which case an additional escort vehicle is added.

Beyond escort configuration, the sources do not identify additional engineering documentation or bridge analysis requirements publicly codified for Superload or Large Structure moves in Kansas. What is confirmed is that both categories undergo KDOT review at the time of permit issuance, and that the permit itself carries movement conditions, including any bridge slowdown requirements, specific to the approved route.

Kansas places the route survey obligation on the escort vehicle operator, not the state and not the carrier independently. Before accompanying any permitted load, every escort vehicle operator (EVO) must personally survey the permitted route. The survey must occur no more than 14 days before the move begins, not 30 days, not the week before; the 14-day window is the regulatory limit. A survey completed 15 or more days out does not satisfy the requirement.

Before the move, all persons who will be moving or accompanying the load must attend a planning and coordination meeting no more than 7 days prior to departure. The meeting must designate the EVOs by name, establish how they will communicate, review any route conditions or restrictions, and verify load dimensions against permit conditions. An EVO cannot simply run a route they surveyed for a similar job last month; the survey and the pre-move meeting are trip-specific.

At the conclusion of each move, a post-trip evaluation is required. Any incidents, citations, property damage, or traffic-control operations lasting more than 15 minutes must be documented. Escort vehicle service providers must retain those trip reports for at least three years.

Specific route-survey triggers: loads exceeding 16 feet in height require the front escort vehicle to carry a nonconductive height pole set at the load's measured height plus 3 inches, physically checking clearances at every overhead obstruction. Kansas ties no formal route survey to a discrete size cutoff; that clearance check applies to all escorted loads rather than starting at a set dimension. Kansas sources do not identify a weight threshold at which a separate bridge engineering analysis or structural review must be completed independently of permit review, beyond what KDOT performs internally before issuing large structure and superload permits.

The Kansas Highway Patrol does not provide escort vehicles for oversize loads. This is unambiguous in the Kansas sources: KHP's role is enforcement and weigh station operations, not load escorting. All escorting is done by private escort vehicle service providers (EVSPs) registered with KDOT. There is no mandatory law-enforcement escort trigger codified in Kansas administrative rules for oversize or overweight moves, no width, height, length, or weight threshold that automatically requires a sworn officer rather than a registered civilian EVSP.

The private escort system is closely regulated. All EVSPs must register annually with KDOT, and there is no fee for that registration. Individual escort vehicle operators must hold certification from one of ten approved states: Arizona, Colorado, Florida, Georgia, Minnesota, North Carolina, Oklahoma, Utah, Virginia, or Washington. Operators certified in other states do not qualify without additional validation. Each escort vehicle must meet equipment standards including a two-way radio with at least a half-mile range, an 18-by-18-inch red or orange fluorescent warning flag on both the driver and passenger sides, rotating or flashing amber warning lights visible at least 500 feet ahead in clear weather, and an "OVERSIZE LOAD" sign meeting the same dimensional standards required on the permitted vehicle itself.

Positioning of escorts is codified: within city limits the leading escort vehicle may not travel more than 500 feet ahead of the load, and outside city limits that distance extends to 1,000 feet. The trailing escort vehicle stays within 500 feet of the rear of the load in all cases. The load must remain visible to both the front and rear escort vehicles at all times, with narrow exceptions for temporary obstructions like steep grades, curves with limited visibility, bridges, or intersections requiring traffic control.

For loads exceeding 126 feet in overall length, Kansas operationally requires an escort through permit conditions even though this threshold is not expressly codified in the administrative regulations. Carriers approaching that length should anticipate escort requirements showing up in their permit conditions regardless of width, height, or weight.