Oversize & Overweight Permit Guide for Carriers and Dispatchers
A general overview of how oversize and overweight (OSOW) permitting works: what makes a load oversize, how state-by-state permitting works, and when escorts or route surveys come into play.
Written for: Carriers, dispatchers, brokers. This guide is general educational information — permit, escort, and compliance requirements vary by state and by load. Contact our team to confirm what applies to your specific move.
What makes a load oversize or overweight
Every state sets its own standard legal limits for width, height, length, and weight before a vehicle combination is considered oversize or overweight. A load that is legal to run in one state without a permit may require one the moment it crosses a state line, since each state applies its own thresholds and rules to the same physical load.
Permits are issued per state, per trip
OSOW permits are generally issued on a state-by-state basis rather than nationally. A single move that crosses several states typically requires a separate permit application, fee, and set of routing restrictions for each state on the route, in addition to any city or county permits that may apply on top of the state permit.
When escorts and route surveys apply
As dimensions grow, states typically require additional safety measures — pilot cars, police escorts, or a full route survey and bridge analysis for the largest superloads. Exactly when these requirements kick in varies significantly by state and by which dimension (width, height, or weight) is driving the oversize classification, which is why a route that looks straightforward on paper can still carry meaningful escort and survey costs.
Why professional permitting matters
Because rules, forms, and processing times differ by state, permit applications submitted without local familiarity are more likely to be delayed by missing documentation or formatting errors. Working with a team that submits these applications daily generally results in faster turnaround and fewer routing surprises once the load is already moving.