Kentucky Oversize Load Permits and Regulations

In Kentucky, you need an oversize permit whenever a vehicle or load exceeds the legal dimensions of 8 feet 6 inches in width, 13 feet 6 inches in height, or 65 feet in total length for a tractor-trailer combination on designated highways. Kentucky Transportation Cabinet (KYTC) regulations apply to all commercial motor vehicles operating on the state's 28,000 miles of public roads, including major corridors like I-65, I-75, and I-64. If your load exceeds these limits, you must obtain a single-trip or annual permit before entering the state to avoid fines that scale based on the degree of the violation. DispatchTool assists carriers in managing these compliance requirements by providing truck-safe routing that accounts for Kentucky-specific bridge clearances and weight-restricted routes. By integrating KYTC bridge data, the platform helps dispatchers plan trips that avoid the 15-foot 2-inch standard clearance issues common on older state routes. Before moving a non-conforming load, you can create a DispatchTool account to map routes that remain within the parameters of your issued permit and track permit documentation in one dashboard.

Legal Dimensions and Weight Limits

Kentucky law defines legal vehicle dimensions under KRS 189.221 and 189.222. The maximum width for any vehicle is 102 inches (8 feet 6 inches) on all state-maintained highways. The maximum height is capped at 13 feet 6 inches. For length, a semi-trailer cannot exceed 53 feet, and the total combination length is restricted to 65 feet on non-designated roads. Weight limits follow the Federal Bridge Formula, with a gross vehicle weight (GVW) cap of 80,000 pounds on five axles. Steer axles are generally limited to 600 pounds per inch of tire width, not to exceed 20,000 pounds. Exceeding any of these metrics necessitates an overweight or oversize permit from the KYTC Division of Motor Carriers.

Permit Costs and Application Fees

The KYTC structure for permit fees is categorized by the duration and type of movement. A single-trip permit for a basic oversize load typically costs $60.00 and is valid for 10 days. If the load is also overweight, the fee increases based on the total GVW: loads between 80,001 and 100,000 pounds cost $80.00, while loads exceeding 160,000 pounds cost $500.00 or more depending on axle configurations. Annual permits are available for specific industries, such as a $250.00 annual permit for non-divisible loads up to 14 feet wide and 13 feet 6 inches high. All applications processed through the Kentucky Overseas Movement system include a processing fee, and carriers must maintain a minimum of $1,000,000 in liability insurance.

Escort Vehicle and Pilot Car Requirements

Kentucky mandates escort vehicles (pilot cars) to ensure public safety when loads reach specific sizes. For loads wider than 10 feet 6 inches but less than 12 feet, one lead escort is required on two-lane highways. Once a load exceeds 12 feet in width, two escorts—one front and one rear—are required on all two-lane roads, and one rear escort is required on four-lane divided highways. If a load exceeds 14 feet in width, Kentucky often requires a Kentucky State Police (KSP) escort in addition to private pilot cars. Height-sensitive loads exceeding 14 feet 6 inches typically require a lead escort equipped with a height pole to verify clearance of overhead obstructions like utility lines and signage.

Kentucky Tolls and River Crossing Restrictions

Transporters must account for the Ohio River Crossings and the RiverLink toll system when moving oversize loads between Kentucky and Indiana. While the Abraham Lincoln and Lewis and Clark bridges are modern, the John F. Kennedy Memorial Bridge has specific lane restrictions for wide loads. Carriers should note that permits do not exempt them from toll fees, which can range from $7.00 to over $15.00 for multi-axle commercial vehicles using a transponder. Furthermore, certain bridges, such as the Brent Spence Bridge on I-71/I-75, have narrow lanes that may require specific timing for loads exceeding 11 feet in width to prevent traffic congestion and side-swipe incidents.

Time of Travel and Holiday Restrictions

Standard oversize travel in Kentucky is permitted from sunrise to sunset, Monday through Saturday. Sunday travel is prohibited for loads exceeding 12 feet in width or 75 feet in length, unless specifically authorized by the KYTC. Holiday restrictions are strictly enforced; movement is typically banned starting at noon the day before New Year's Day, Memorial Day, Independence Day, Labor Day, Thanksgiving, and Christmas. In high-traffic metropolitan areas like Louisville, Lexington, and Northern Kentucky (Cincinnati area), the KYTC may restrict travel during morning and evening rush hours (7:00 AM – 9:00 AM and 4:00 PM – 6:00 PM) to minimize the impact on commuter flow.

Signage, Lighting, and Safety Equipment

Any vehicle operating under an oversize permit must display 'OVERSIZE LOAD' signs on both the front and rear. These signs must be at least 7 feet long and 18 inches high, with black letters 10 inches tall on a yellow background. Red or orange fluorescent flags, at least 18 inches square, must be placed at the widest extremities of the load. During times of low visibility or when 24-hour travel is permitted for specific loads (such as those only slightly over length), amber strobe or flashing lights must be visible from 360 degrees. Failure to maintain proper visibility equipment is one of the most common citations issued by Kentucky Vehicle Enforcement (KVE) officers during roadside inspections.

Sources

Kentucky Transportation Cabinet - Division of Motor Carriers (2024) — https://transportation.ky.gov/Motor-Carriers/Pages/Overweight-Overdimensional-Permits.aspx Kentucky Revised Statutes (KRS) Chapter 189 (2024) — https://apps.legislature.ky.gov/law/statutes/chapter.aspx?id=38198 FMCSA State Weight Limits (2023) — https://ops.fhwa.dot.gov/freight/policy/rpt_congress/truck_sw_laws/app_a.htm

Frequently asked

What is the max width allowed without a permit in Kentucky?

The maximum legal width in Kentucky is 8 feet 6 inches (102 inches). Any load wider than this requires a KYTC permit and must follow specific routing and escort requirements.

How much does a Kentucky oversize permit cost?

A single-trip permit for a basic oversize load is $60.00. Overweight loads vary by weight, ranging from $80.00 for loads up to 100,000 lbs to over $500.00 for superloads.

Are there night travel allowances for oversize loads in KY?

Generally, no. Movement is restricted to daylight hours (sunrise to sunset). However, loads that are only overweight but within legal dimensions may sometimes be granted 24/7 travel privileges.

When are pilot cars required in Kentucky?

Pilot cars are required when a load exceeds 10 feet 6 inches in width on two-lane roads, or 12 feet in width on four-lane highways. Loads over 14 feet wide usually require two escorts.

Does Kentucky allow Sunday travel for oversize loads?

Sunday travel is only permitted for loads that do not exceed 12 feet in width, 13 feet 6 inches in height, or 75 feet in length. Larger loads are restricted to Monday through Saturday.