Oklahoma Oversize Load Permits, Regulations & Axle Rules

Oklahoma splits oversize from overweight-only on movement hours. Any load over legal dimensions runs in daylight, defined as 30 minutes before sunrise to 30 minutes after sunset. Overweight-only loads run continuously, 24 hours a day, seven days a week. A load that's purely heavy but legal-size can roll through the night with no daylight restriction.

Oversize loads face Interstate curfews in three metro counties. In Oklahoma County (Oklahoma City), Tulsa County, and Cleveland County, oversize permitted loads stay off the Interstate from 7:00 AM to 9:00 AM and 3:30 PM to 6:30 PM, Monday through Friday. One exception: the two-mile stretch of I-35 in Cleveland County between the SH-9 East interchange (Exit 108) and the SH-9 West interchange (Exit 106) is exempt. Overweight-only loads, special combination vehicles, and longer combination vehicles are exempt from the curfew entirely.

Oversize loads follow holiday restrictions set by state statute, but the rules reference the holiday list without publishing the full text. Confirm current blackout dates directly with the Oklahoma Department of Transportation (ODOT) before scheduling around the calendar.

On weather, ODOT requires extreme caution in snow, ice, sleet, fog, rain, dust, smoke, or high wind. When conditions turn dangerous, movement stops and can't resume until the load moves with reasonable safety. The state can restrict or prohibit operations when it deems road conditions unsafe. Oklahoma sets no around-the-clock movement exception for oversize loads.

Oklahoma carves out several commodity categories with dimensions or routing that differ from the general oversize framework.

Poles and gas lines used for public utility maintenance, not new construction, are exempt from length restrictions as long as overall length stays at or under 80 feet. Movement is daylight-only, except in genuine emergencies when nighttime travel is allowed.

Agriculture gets limited relief: hay, raw forest products, and soil conservation equipment each qualify for a $25 annual permit. Raw forest products and soil conservation equipment are restricted to non-Interstate roads.

Stinger-steered auto transporters may run up to 75 feet overall on the National Network, front overhang capped at 3 feet and rear overhang at 4 feet beyond the transporter.

Special mobilized machinery (including rubber-tired cranes) runs under an annual operating permit; any unit over 12 feet wide and 15 feet high can't get an annual oversize permit and moves single-trip. Special combination vehicles (triples) are limited to Interstate and four-lane divided federal-aid primary highways, with no operation in decreased visibility, lateral winds above 45 mph, or slick, icy, or snow-packed pavement.

Oklahoma uses the term superload and defines it through its Standard Drawing OL-1, a set of reference truck configurations published by ODOT. Any overweight permit load that exceeds the OL-1 truck standards crosses into superload territory. ODOT has pre-engineered a range of heavy-truck axle layouts and gross weights; a load that falls within those configurations routes through ordinary permit review on pre-approved ("green") roads. A load whose axle arrangement, axle weights, or total gross weight exceed what any OL-1 truck allows is a superload and needs individual structural analysis. The OL-1 drawing sets the ceiling, and exceeding it on any axis triggers the elevated process.

Width runs on a separate track. Any load wider than 16 feet is barred from the Interstate; the single-trip permit cap on the Interstate is 16 feet. Off-Interstate on state highways, newly manufactured loads from over 16 feet to 23 feet wide may apply for a Special Movement permit for $500.

For weight-based superloads, ODOT requires a minimum of five working days advance notice before the requested movement date, and more time when the route crosses multiple bridges. The core requirement is a detailed structural analysis of each bridge the load crosses, performed in strict conformance with the AASHTO Manual for Bridge Evaluation. If the route was studied previously for that load configuration, an existing approval may carry over; if not, the carrier or a professional engineer of the carrier's choosing must conduct it, with a PE seal on all documents. ODOT's Bridge and Maintenance Divisions conduct or review the analysis, and ODOT can require an evaluation of potential pavement damage on specific routes. No overweight vehicle may route over any state highway bridge with an inventory rating below H-15 without a specific load route review first.

Dual-lane axle superloads (side-by-side axle configurations) face additional geometric minimums (axle spacing, gage, and wheel-to-wheel distance) and are capped at 16 feet wide on the Interstate and 20 feet wide on the state highway system.

There's no published superload process for extreme overheight or overlength as distinct categories; those dimensions route through ordinary permit review and the escort requirements in the other sections.

Oklahoma's route review attaches at two thresholds, one dimensional and one weight-based.

On the height side, any load 15 feet 9 inches or taller triggers a mandatory route clearance: the permittee contacts all public utilities and railroads along the entire proposed route ahead of the move. ODOT maintains a specific application form for loads at or above this height. The front escort vehicle carries a height measuring pole made of non-conductive, flexible, non-fragile material. This notification is effectively a pre-move route clearance, with the carrier coordinating with every overhead line owner and rail crossing operator before wheels turn.

On the weight side, any overweight permit application that exceeds the Gross Weight Load Table must be referred in writing to ODOT's Bridge and Maintenance Divisions for a specific load route review. Bridge analysis conforms strictly to the AASHTO Manual for Bridge Evaluation, and computed stresses may not exceed AASHTO-specified values under any circumstances. ODOT may further reduce allowable stress values for deteriorated structures. The review must be requested at least five working days before the intended movement date; routes with many bridges may need more lead time. Once reviewed and approved, the route binds the move: follow the permitted routing exactly, carry the routing document in the vehicle, and comply with every bridge and highway load restriction on the approved path. ODOT publishes the Special Overweight Truck Permit Route Map: green routes were previously studied for OL-1-configuration trucks and can be permitted without individual bridge review; red routes can't support OL-1 trucks; black or unshown routes require individual review.

Holders of Annual Envelope Vehicle Permits take on self-survey duties: obtain ODOT's Vertical Clearance of Bridge Structures Map, verify it's current, confirm construction restrictions along the planned route, and travel only on green routes on the Annual Envelope route map.

The structural review is a precondition of the permit for any load that requires it. Bridge approval exists before the permit issues, not after the move is underway.

Oklahoma's law enforcement escort system is fully discretionary. There are no published dimensional or weight thresholds that automatically require an Oklahoma Highway Patrol (OHP) escort. ODOT maintains an OHP Escort Contract application for loads where the permit reviewer decides an OHP trooper may be needed. The decision is case by case through that application.

Route-specific OHP requirements can also appear independent of load dimensions. Certain highways carry standing trooper escort requirements posted on ODOT's route restriction list; State Highway 10 (OK-10) is a documented example where trooper escort may be required regardless of load size.

The agency is the Oklahoma Highway Patrol, specifically OHP Troop S for commercial vehicle enforcement. Reach OHP Communications at 405-425-2323. Because there's no codified dimensional trigger, the practical approach is to submit the permit application and check whether ODOT attaches an OHP Escort Contract requirement. The permit office is the entry point, not a direct call to OHP. Civilian escort vehicles, certified through a course at Oklahoma State University's Center for Local Government Technology (75% passing score, five-year certification term), handle all the codified oversize escort thresholds. OHP involvement layers on top at the permit office's discretion, not in lieu of those civilian escorts.