Minnesota Department of Transportation

511 Travel Info

Roadway Data

Information about Minnesota's roads from the Transportation Information System database

traffic on a highway

What is functional classification?

Functional classification is the grouping of streets and highways into classes or systems according to the character of service they are intended to provide. Basic to this process is the recognition that most travel involves movement through a network of roads. Functional classification defines the role that any particular road or street plays in serving the flow of trips through an entire network.


Changing classification or classifying planned non-existent roads


Functional class mileage


Planned non-existent roads

View PDF maps of the locations, current as of October 2008

Greater MN counties

Greater MN cities

Greater MN MPO


Federal law requires in CFR §470.105(b)(1) that:

The State transportation agency shall have the primary responsibility for developing and updating a statewide highway functional classification in rural and urban areas to determine functional usage of the existing roads and streets. . . . The State shall cooperate with responsible local officials, or appropriate Federal agency in the case of areas under Federal jurisdiction, in developing and updating the functional classification.

This applies to all public roads in Minnesota (~138,000 miles) and is used in state and local planning, as well as in the determination of eligibility for Federal and State Aid.


Comprehensive functional classification system updates

MnDOT works in partnership with the state’s regional development commissions (RDCs) and metropolitan planning organizations (MPOs) to periodically review and revise the statewide Functional Classification System. Complete updates to the statewide Functional Classification System are undertaken infrequently, with the most recent completed in 2009 and approved by FHWA in 2010. This web page functions as a repository for the resulting system maps and mileage tables. The next major update is anticipated within the next 4-6 years, or following any substantial federal revision of guidelines for the system.

Individual roadway changes of functional classification

The functional classification change process (PDF) indicates that a change request is considered accepted and approved upon the signature of the District Planner or District State Aid Engineer. It is the responsibility of the submitting Regional Development Commission and/or Metropolitan Planning Organization staff to assure that the change conforms with FHWA’s Functional Classification Guidelines and that conformance is reflected in the change request form. In signing the requests, District Planners/State Aid Engineers are concurring that the change is in conformance with the FHWA Guidelines.

MnDOT’s Office of Statewide Multimodal Planning (OSMP) with assistance from OCPPM will review the classification percentages by planning area (MPO or RDC) on at least an annual basis to assure that the overall system percentages are consistent with FHWA Functional Classification Guidelines.