Ohio Oversize Load Permits, Regulations & Axle Rules

Ohio runs all oversize loads strictly on daylight, defined as one-half hour before sunrise to one-half hour after sunset, seven days a week. There's no weekend travel ban as such, but width is the real lever: any load wider than 12 feet picks up a separate Saturday and Sunday restriction that goes well beyond "daylight only." Those loads may not move from 3:00 PM Saturday until one-half hour before sunrise Sunday, nor from 3:00 PM Sunday until one-half hour before sunrise Monday. Between April 1 and November 30, the Friday afternoon cutoff is the same: no movement from 3:00 PM Friday until one-half hour before sunrise Saturday. A load that's wide and slow on a late Friday afternoon in October can easily be pinned until Monday morning.

Loads wider than 12 feet running through any of Ohio's 22 designated urban counties (a list covering every major metro from Cuyahoga and Franklin to Hamilton and Lucas) face an additional weekday curfew of 6:30 to 9:00 AM and 4:30 to 6:00 PM, Monday through Friday. These are the Columbus, Cleveland, Cincinnati, Toledo, Akron, Dayton, and Youngstown metro areas in practice; if a route touches any of those counties during rush hours and the load is over 12 feet wide, the load waits.

Oversize loads are prohibited entirely on seven holidays: New Year's Day, Good Friday through Easter, Memorial Day, Independence Day, Labor Day, Thanksgiving, and Christmas. The no-travel window runs from noon the day before each holiday until one-half hour before sunrise the day after, enough to swallow a full weekend when a Monday holiday follows a Saturday and Sunday. Good Friday/Easter has its own timing: the blackout begins at sunrise on Good Friday and doesn't lift until one-half hour before sunrise on the Monday after Easter.

One notable carve-out: a load that is overweight only (no oversize dimension) faces none of these hour, day, or holiday restrictions, as long as the vehicle can move without obstructing traffic flow. That distinction matters for heavy-but-legal-size loads.

Any oversize permit is automatically voided when road, weather, or traffic conditions make travel unsafe, as determined by the Ohio State Highway Patrol (OSHP) or local law enforcement on scene. Ohio publishes no specific visibility or wind-speed threshold for standard oversize loads. No provision for continuous 24-hour movement exists in the sources.

Ohio also runs a fragmented permit system. ODOT issues permits for state routes and interstates. The Ohio Turnpike and Infrastructure Commission (OTIC) runs the Turnpike separately; an ODOT permit that routes onto the Turnpike does not cover it, so a separate Turnpike permit is also required. County engineers cover county and township roads, and municipalities handle local streets. The Turnpike imposes its own daylight restrictions: any vehicle wider than 10 feet, longer than 90 feet, or with rear overhang exceeding 4 feet is restricted to daylight travel only on the Turnpike regardless of ODOT permit conditions.

Ohio's statutory exemptions are broad for a few commodity classes and narrow for others.

Farm machinery and equipment is the most sweeping: it's entirely exempt from all dimension limits under Ohio law, including width, height, length, and overhang. No oversize permit is required simply because farm equipment exceeds normal size limits. A separate farm equipment blanket permit covers moves up to 14 feet wide with unlimited trips over 365 days.

Wooden and metal poles, pipes, and well-drilling equipment are similarly exempt from all dimension limits; the statute carves them out without conditions. Vehicles and pole trailers hauling those commodities may exceed any standard dimension without triggering the oversize permit framework for dimensions alone, though weight rules still apply independently.

Dozer blades on construction equipment have their own width tiering. A blade up to 12 feet wide has no restrictions. A blade wider than 12 feet but no wider than 14 feet is limited to a 25-mile radius from its origin unless a traffic protector device is used. A blade wider than 14 feet requires a traffic protector device; without one, the blade must be removed and hauled separately. A blade wider than 15 feet including its traffic protector device is not permitted on Ohio state highways at all. Construction equipment blanket permits (up to 12 feet wide, otherwise legal) cover unlimited moves over 365 days.

Wire mesh and barmat loads up to 12 feet wide may be permitted if plywood or equivalent sheathing covers both sides of the load.

Steel and aluminum coils can be permitted overweight as a single-coil continuing permit from approved Ohio facilities; a permit for more than one coil is not issued because multiple coils constitute a divisible load.

Ohio uses the standard term Superload. A load enters this tier when it exceeds any one of four thresholds: gross vehicle weight over 120,000 lbs, axle or axle-group weights over the Section 9 permit limits (more than 29,000 lbs on a single axle, more than 50,000 lbs on a tandem, more than 60,000 lbs on a tri-axle, or more than 80,000 lbs on a quad-axle), overall width over 14 feet, or overall height over 14'6". One threshold is enough; a load that is only 14'2" wide is a Superload by width regardless of its weight, and a 125,000 lb load is a Superload by weight regardless of its dimensions.

On the dimension side, 14 feet wide is also Ohio's practical ceiling for routine multi-lane permits; the standard permit system tops out at 14 feet on multiple-lane highways, so anything above that enters Superload territory. There's no Superload trigger for length alone.

Superload permits are single-trip only. No continuing or blanket Superload permits are issued. ODOT requires the route to run from the place of manufacture or port of entry directly to the final site of installation, no intermediate stops at warehouses, displays, or staging areas. Any detour to a secondary destination removes the move from consideration.

For Superloads by weight, bridge analysis is the central step. Loads up to 250,000 lbs GVW are analyzed in-house by the Special Hauling Permit Section; loads above 250,000 lbs are forwarded to the ODOT Office of Structural Engineering, which normally completes its review within about two weeks but may take longer depending on the complexity of the route and configuration. ODOT may also require an ODOT escort at conditional bridge crossings depending on the number, location, and severity of structures along the route.

For Superloads by dimension, permit applications require up to three working days to process. Either category may require the applicant to submit a route survey, shipper's certification, a vehicle and load diagram, and any local authority permits the route crosses. All Superload applicants should assume lead time well beyond a standard five-day single-trip permit. When OSHP escort is required, at least 48 hours advance notice must be given, and the move must commence within one hour of the scheduled departure time.

Ohio does not publish a codified dimension or weight threshold that automatically triggers a formal route survey for standard oversize permits. Instead, the permittee bears a standing responsibility to check the route for any abnormal, changed, or unusual conditions before movement, a self-survey obligation that applies to every Special Hauling Permit.

For standard loads that involve unusual heights or route complexity, ODOT may identify during permit review that a special engineering analysis is needed, including a visual inspection, field measurements, and strength analysis of pavement and bridges along the route. Applications where this is likely should be submitted well in advance of the intended move.

For Superloads, the route survey requirement becomes explicit rather than conditional. Superloads by weight are subject to in-house bridge analysis up to 250,000 lbs GVW and OSE structural review above that threshold. ODOT may additionally require a physical route survey, shipper's certification, a vehicle and load diagram, and local authority permits for any portion of the route on county or municipal roads. Superloads by dimension may be asked for the same documentation package. Neither set of requirements is published as an automatic trigger tied to a specific number; ODOT requests what it determines is necessary based on the application.

Heights above 14'10" carry their own coordination obligation: the permittee must contact the owners of every overhead sign, signal, utility, and other obstruction along the route to arrange lifting or clearing before movement begins. That coordination is a precondition for travel at those heights, not a post-permit administrative step.

Utility conflict resolution throughout is the permittee's responsibility. Ohio's permit conditions state explicitly that removal or raising of overhead wires and cables falls on the mover, and the Central Permit Office may require documentation confirming utility companies have been notified before a permit is finalized.

On county roads, Hardin County and Warren County each conduct their own route inspections and may commission a road capacity study or structural analysis, at the applicant's expense, when an engineer determines the proposed move could cause pavement or structure damage. These analyses can extend processing to 10 or more working days.

Ohio has one firm codified trigger for law-enforcement escort and a broad discretionary authority on top of it. Any load with an overall permitted width over 16 feet requires Ohio State Highway Patrol (OSHP) escort in addition to whatever private pilot escorts the load already carries. That escort requirement is independent of and stacks on top of the width-based private escort requirements; a 16'2" load needs both its private escorts and OSHP.

Beyond that threshold, ODOT may require law-enforcement escort for any movement that, in its judgment, carries a high probability of delay or hazard to the traveling public or damage to highway facilities. That discretionary authority carries no fixed dimension or weight marker; it applies to any movement ODOT flags during permit review. Law-enforcement vehicles are not counted as private escorts unless the permit specifically states otherwise.

For Superloads, the need for OSHP escort is determined permit by permit and shown on the "Special Limitations" page of the Superload permit. When OSHP is required, a minimum 48-hour advance notice to the Patrol is mandatory, and departure must begin within one hour of the scheduled time. Carriers should not attempt to arrange OSHP scheduling until after ODOT has reviewed the permit application and indicated an escort is needed; the permit process leads, and the Patrol is contacted from there.

Ohio does not coordinate OSHP escorts through a central booking system open to carriers outside the permit process. The arrangement flows through ODOT's Special Hauling Permit Section for Superloads and through the general permit conditions for width-triggered movements.

At the county level, Warren County's law-enforcement escort requirement is at the discretion of the County Engineer, with the permit holder directed to contact the Warren County Sheriff's Office. Hardin County may require a County Engineer representative to be present during the movement rather than a sworn officer escort.