Minnesota Department of Transportation

511 Travel Info

Commercial Vehicle Operations

Route survey

You will need to have a physical route survey when an oversize load exceeds 16 feet high, 20 feet wide, or 175 feet long.

A route survey can remain valid for up to 60 days, as long as following moves are:

  • The same dimensions as initial survey
  • Transported by the same carrier
  • At least one movement happens within a 14-day period

Please allow five business days for processing. Applications with route failures or bridge discrepancies may take longer. We will not accept a route survey if information is entered incorrectly or does not meet our criteria.

Carrier responsibilities

As the carrier of the oversize/overweight load, you will need to do a physical route survey before the load moves to ensure clearance and before MnDOT issues the permit.

  • For loads exceeding 16'-0" high: a nonconductive, nondestructive, flexible, and readily breakable height pole must be used and set as a minimum of six inches higher than the highest part of the load.
  • For loads exceeding 20'-0" wide: a minimum of one foot lateral clearance is required through construction work zones. Check 511 for current road conditions and construction project information.
  • A minimum of six inches is required underneath all vehicle components
  • Identify all railroad at-grade crossings along the route and verify that the loading can navigate those railroad crossings safely and quickly
  • Notify utility companies for approval to raise or move their overhead wires
  • Obtain approval to operate on local roads. MnDOT permits are not valid for local roads
  • No obstructions can be moved or removed without written permission from the owner.
  • The Pre-Trip Route Survey must identify which traffic lane is to be used to maneuver under a low clearance. Maneuvers, such as backing up or using opposing traffic lanes, must be clearly listed
  • The permit application route must match the survey route