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maine's transportation 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.
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.
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
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