New Hampshire Highway System
| New Hampshire Highway System | |
|---|---|
   
Standard highway markers for Interstate 93, U.S. Route 3, New Hampshire Route 16, and the Everett Turnpike
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| System information | |
| Length: | 4,814 mi (7,747 km) |
| Notes: | NHDOT maintains 17,029 mi (27,406 km) of roads in total |
| Highway names | |
| Interstates: | Interstate X (I-X) |
| US Highways: | U.S. Route n (US X or Route X) |
| State: | New Hampshire Route X (NH X or Route X) |
| System links | |
The New Hampshire Highway System is the public roads system of the U.S. state of New Hampshire containing approximately 17,029 miles (27,406 km) maintained by the New Hampshire Department of Transportation (NHDOT). All public roads in the state are called "highways", thus there is no technical distinction between a "road" or a "highway" in New Hampshire.
The state maintains 4,814 miles (7,747 km) of roads, of which 2,567 miles (4,131 km) are numbered routes and 1,465 miles (2,358 km) are unnumbered roadways making up the state's secondary roadway system. The state has 557 miles (896 km) of primary highways, which it defines as highways that "connect population centers, other NHS routes within the state, and other NHS routes in the surrounding states: Vermont, Maine, and Massachusetts." The remaining 12,215 miles (19,658 km) of roads are maintained typically by the towns and cities traversed by these roads.
Highways assigned a number by the NHDOT are officially known as "New Hampshire Route X", often abbreviated "NH Route X" or simply "NH X".
Many minor state highways are not assigned numbers, only local names.
A total of 224.2 miles (360.8 km) of roadway in New Hampshire are part of the Interstate Highway system.
The NHDOT Bureau of Turnpikes is responsible for maintenance of the public toll roads in New Hampshire:
782 miles (1,259 km) of state-maintained roads are a part of the National Highway System (NHS). Of the NHS roads in the state, 225 miles (362 km) are Interstate highways (35 miles (56 km) of which are also on the New Hampshire Turnpike System; 52 miles (84 km) of non-interstate turnpike highways; and 505 miles (813 km) of non-interstate and non-turnpike highways.
New Hampshire RSA 229:5 Classification. sets out the seven different classes of highways in the state:
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