How Oversize Permits Work

What a permit covers, and what it does not

An oversize or overweight permit lets one specific vehicle and load use specific roads on specific days. States issue them only for nondivisible loads, the ones that would lose their use or value if split, or would take more than 8 work hours to take apart (23 CFR 658.5). A machine that could be brought within limits by taking off a blade or bucket is expected to travel that way.

The permit covers only the issuing agency's roads. New York's is a good example: an NYSDOT permit is valid on state highways, but the NYS Thruway, the NYS Bridge Authority, New York City DOT and county, town and village road owners each issue their own. Illinois works the same way, with separate permission for local roads, Chicago streets, Cook County roads and the Illinois Tollway. The toll roads that need their own permits are listed on our heavy haul trucking page.

What the application asks for

1. The load. What it is, and its overall width, height, length and overhang as it sits on the trailer, not the brochure's operating size.
2. The weights. Gross weight and the weight on each axle or axle group, with the spacing between every axle. Overweight permits are judged axle group by axle group, which is why the Bridge Formula calculator matters before you apply.
3. The truck and trailer. Plates, unit numbers and the carrier's USDOT number; New York's HOOCS is reached through OSCAR, which needs a USDOT number.
4. The route. Origin, destination and the roads in between. Many systems route the load themselves (Pennsylvania's APRAS, Georgia's GAPROS, Texas's TxPROS) and the permit lists the turns the driver must follow.
5. The dates. The permit runs from a start date for a fixed window, so pick it after the carrier and any escorts are confirmed.

Larger loads add paperwork before the state will issue anything:

How long it takes to get one

Routine single-trip permits go through each state's online system, and most loads within normal oversize ranges are issued without an engineering review. Arizona, for example, gives an average issue time of 48 hours for its Class C permits, not counting evenings, weekends and state holidays. Turnpikes keep their own clocks: the Pennsylvania Turnpike asks for at least one business day for engineering review on its permits.

Lead time grows with the load. Once a move needs a bridge analysis, a route survey or police, plan in weeks: Pennsylvania wants the preliminary superload application three weeks ahead and Texas Super Heavy permits take 3 to 4. Each state's superload line is in the comparison on our heavy haul page, and the escorts those loads need are on the pilot car requirements by state page.

How to read a permit

Check these lines before pickup, because the driver is held to all of them: the permit number and the days it is valid; the vehicle by plate or unit number; the permitted width, height, length and weights; the route, turn by turn; the travel windows, including curfews and holiday bans; the escort conditions (how many, where they ride, certification, height pole); and any special conditions such as utility notice, bridge speed limits or police escort times. New Jersey, for one, voids a permit for a load over 14 ft high if the utilities were not notified.