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Highway Systems

Federal Highway System (National Highway System)

The National Highway System consists of roadways important to the nation's economy, defense, and mobility. The NHS was developed by the Department of Transportation (DOT) in cooperation with the states, local officials, and metropolitan planning organizations (MPOs).

The system in Maine generally includes includes the Interstate highway system plus “other principal arterials” plus our Intermodal Connectors. A listing of all official NHS roads plus the Intermodal Connectors is available here.

These highways must be designated by MaineDOT's Commissioner and approved by FHWA and they are eligible for federal funding from Maine's NHS allotment.

  1. NHS- Interstate Highways designated Interstate Highways. All Interstate Highways are on the National Highway System. Maine Interstate Highways: I-95, I-195, I-295 and I-395 . Currently there are 367 miles of this category.
  2. NHS Highways that have a federal functional classification of Other Principal Arterial or Principal Arterial-(Other Freeways or Expressways) designated by MaineDOT's Commissioner and approved by FHWA and Congress. Currently there are 904 miles of this category.
  3. NHS Intermodal Connectors have a federal functional classification of Major Collector or higher, designated by MaineDOT's Commissioner and approved by FHWA. Currently there are 23 miles of this category.
  4. FA-NON-NHS Highways that have a federal functional classification of Major Collector or higher and are not on the NHS-Interstate of NHS systems. These highways are eligibile for federal highway funds from the Surface Transportation Program, a collection of federal funding sources. Currently there are 5,022 miles of this category.
  5. NON-FEDERAL Highways that have a federal functional classification of minor collector and local. Currently there are 16,484 miles of this category.

State Highway Systems

State Highway (SH)

A system of connected main highways throughout the state which primarily serve arterial or through traffic. With the exception of urban compact areas, State Highways are mostly maintained by the MaineDOT.

State Aid Highways (SA):

Those highways not included in the system of the state highways which primarily serve as collector and feeder routes connecting local service roads to the arterial state highway system. Generally, State-Aid Highways in the rural area are maintained by the MaineDOT in the summer and by the town in the winter. Any State-Aid Highways in the urban compact area are maintained by the town.

Townways

All Other highways not included in the state highways and state-aid highway systems, which are maintained by the towns and primarily serve as local service roads providing access to adjacent land.

 

 

This page last updated on 3/28/14