What makes a load over-dimensional, which legal limits apply and how permits and escorts work across states.
Over-dimensional (OD) freight exceeds the standard legal size or weight limits for highway travel. Moving it legally requires permits and, often, escorts and travel restrictions.
Typical legal limits
- Width: 8 feet 6 inches.
- Height: typically 13 feet 6 inches to 14 feet, depending on the state.
- Length: set by each state for trailers and overall vehicles.
- Weight: 80,000 lb gross on interstates, with limits per axle group.
Permits
Each state’s transportation agency issues oversize and overweight permits. Permits specify the approved route, travel times and any escort requirements. Loads crossing several states need a permit from each.
{{fig:highway.webp|Over-dimensional loads follow permitted routes and travel windows.}}Escorts and signage
As dimensions increase, states require “Oversize Load” banners, flags and lights, then one or more pilot vehicles, and for the largest loads sometimes police escorts.
Travel restrictions
Many states limit oversize travel to daylight hours and restrict movement on weekends and holidays. Weather and construction can also affect permitted routes.
See our over-dimensional transportation service.
Ready to move your freight?
Get a clear quote for truckload, heavy haul, intermodal or dedicated freight.
