Maine State Highway System

Maine State Highway System
Standard markers in Maine
System information
Length:	22,236 mi (35,785 km)
Highway names
Interstates:	Interstate x (I-X)
US Highways:	U.S. Route x (US-X)
State:	State Route x or Route x (SR X)
System links
Maine State Highway System Interstate U.S. State

In the state of Maine, the Maine Department of Transportation (MaineDOT) has a system of numbered highways, defined as the "connected main highways throughout the state which primarily serve arterial or through traffic." As of 2006, 22,236 miles of roadway are included in the highway system, including Interstate highways, U.S. Routes, state highways, and other urban and rural local roads.

Maine has one primary Interstate highway, I-95, within its borders, as well as four of its spurs: I-195, I-295, I-395, and I-495 (which is unsigned). All Interstate highways in Maine are part of the National Highway System and, as such, receive some degree of federal funding. All of these highways are freeways and are built under set standards for roadway design.

Maine contains two primary U.S. numbered highways: U.S. Route 1 and U.S. Route 2.

These routes are generally maintained and funded in the same manner as state routes, with these responsibilities falling to the MaineDOT.

State routes in Maine are numbered and signed by the state, and by extension are also generally maintained and funded by the state, except in areas designated as "urban compact areas," defined by MaineDOT as "those in which the population according to the last United States census exceeds 7,500 inhabitants. Urban compact municipalities are also those in which the population according to the last United States census is less than 7,500 inhabitants but more than 2,499 inhabitants, and in which the ratio of people whose place of employment is in a given municipality to employed people residing in that same municipality according to the last United States census is 1.0 or greater." In this case, the section of road is the responsibility of the municipality.