| Interstate Highways of the New Hampshire Highway System | |
|---|---|
Highway marker for Interstates 93 and 293 | |
 Interstate Highways highlighted in red | |
| System information | |
| Formed | August 14, 1957 [1] |
| Highway names | |
| Interstates | Interstate nn (I-nn) |
| System links | |
The Interstate Highways in New Hampshire comprise three current primary Interstate Highways and two auxiliary Interstates. In addition, one auxiliary Interstate number has been decommissioned along with a lone business Interstate.
| Number | Length (mi) [2] | Length (km) | Southern or western terminus | Northern or eastern terminus | Formed | Removed | Notes | |
|---|---|---|---|---|---|---|---|---|
 I-89 | 60.864 | 97.951 | I-93 & NH 3A in Bow | I-89 at Hartford, VT | 1967 | current | Highway continues north into Vermont. | |
 I-89 BL | 3.9 | 6.3 | I-89 at Enfield | I-89 at Lebanon | 1968 | 2000 | From I-89 Exit 17 to Exit 19 along current US 4. Only one shield remained for the route in July 2000 and it was taken down by 2004. It was the only Interstate Business route in New Hampshire. | |
 I-93 | 131.764 | 212.054 | I-93 at Methuen, MA | I-93 at Waterford, VT | 1957 | current | Partially tolled between Manchester and Concord as part of the Everett Turnpike. Continues south into Massachusetts and north in Vermont. | |
 I-95 | 16.193 | 26.060 | I-95 at Salisbury, MA | I-95 at Kittery, ME | 1957 | current | Tolled as the New Hampshire Turnpike. Continues south into Massachusetts and north into Maine. | |
 I-193 | 3.291 | 5.296 | I-93/NH 101 in Manchester | Everett Tpk. in Bedford | 1961 | 1976 | Southern leg of what is now designated I-293. | |
 I-293 | 11.771 | 18.944 | I-93/NH 101 in Manchester | I-93/Everett Tpk. in Hooksett | 1976 | current | Southern leg formerly designated I-193 (1961-1976). | |
 I-393 | 4.594 | 7.393 | US 202 in Concord | US 4/US 202/NH 9 in Pembroke | 1979 | current | Concurrent with US 4/US 202 the entire length | |
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The Dwight D. Eisenhower National System of Interstate and Defense Highways, commonly known as the Interstate Highway System, or the Eisenhower Interstate System, is a network of controlled-access highways that forms part of the National Highway System in the United States. The system extends throughout the contiguous United States and has routes in Hawaii, Alaska, and Puerto Rico.
Interstate 89 (I-89) is an Interstate Highway in the New England region of the United States traveling from Bow, New Hampshire, to the Canada–United States border between Highgate Springs, Vermont, and Saint-Armand, Quebec. As with all odd-numbered primary Interstates, I-89 is signed as a north–south highway. However, it follows a primarily northwest-to-southeast path. The route forms a major part of the main connection between the cities of Montreal and Boston. In Quebec, the route continues as Route 133. The eventual completion of Autoroute 35 will lead to a nonstop limited-access highway route between Boston and Montreal, following I-93 south from I-89's terminus. The largest cities directly served by I-89 are Concord, the state capital of New Hampshire; Montpelier, the state capital of Vermont; and Burlington, Vermont. I-89 is one of three main Interstate highways whose route is located entirely within New England, along with I-91 and I-93.
Interstate 495 (I-495) is an auxiliary route of I-95 in the US state of Massachusetts, maintained by the Massachusetts Department of Transportation (MassDOT). Spanning 121.56 miles (195.63 km), it is the second-longest auxiliary route in the Interstate Highway System, being roughly 11 miles (18 km) shorter than I-476 in Pennsylvania.
The Falmouth Spur is a short freeway connecting Interstate 95 (I-95) with I-295 and US Route 1 (US 1) north of Portland, Maine, in the United States. It carries the unsigned designation of Interstate 495 (I-495). As part of the Maine Turnpike, the mainline of which carries I-95, the Falmouth Spur is a toll road. The spur has only two interchanges—one at each end—and a toll booth in the middle. It is signed only for its destinations—I-95, I-295, and US 1—to minimize driver confusion.
Interstate 225 (I-225) is an auxiliary Interstate Highway in the U.S. state of Colorado. The freeway is a 11.959-mile-long (19.246 km) connector spur route of I-25 that acts as an eastern bypass in the Denver metropolitan area and serves Aurora. It also provides direct access to Denver International Airport for the Denver Tech Center and the southern suburbs of Denver. I-225 is one of the two existing auxiliary Interstate Highways in Colorado and it is the only auxiliary route of I-25. The route begins at I-25 in the Denver Tech Center and runs north to I-70 north of Aurora. It interchanges with State Highway 83 (SH 83), SH 30 and I-70 Business/US 40/US 287, known locally as Colfax Avenue. The freeway was first proposed in the 1950s along with the first Interstate Highways within Denver. Construction did not begin until 1964 at the I-70 interchange and proceeded south through Aurora until final completion in early 1976 with the final link to I-25 opening to traffic.
Interstate 293 (I-293) is an 11-mile-long (18 km) auxiliary Interstate Highway surrounding Manchester, New Hampshire, roughly shaped like two sides of a triangle. Completing the loop in the northeast is I-93. The southern portion of the loop shares the road with New Hampshire Route 101 (NH 101) and passes near Manchester–Boston Regional Airport and The Mall of New Hampshire. The western portion of the loop shares the road with the Everett Turnpike, but there are no tolls on this portion of the turnpike.
New Hampshire Route 16 is a 154.771-mile (249.080 km), north–south state highway in New Hampshire, United States, the main road connecting the Seacoast region to the Lakes Region and the White Mountains. Much of its length is close to the border with Maine. The section from Portsmouth to Milton is a controlled-access toll highway known as the Spaulding Turnpike. Between Milton and Chocorua, and between Conway and Glen, it is known as the White Mountain Highway. It is known as Chocorua Mountain Highway between Chocorua and Conway and various other local names before crossing into Maine about 20 miles (32 km) south of the Canadian border. Portions of NH 16 run concurrent with U.S. Route 4 (US 4), US 202, NH 25, and US 302, and US 2.
Interstate 393 (I-393) is a 4.6-mile (7.4 km) east–west auxiliary Interstate Highway extending from I-93 at Concord to Pembroke, New Hampshire. The primary purpose of the road is to bypass a densely built commercial strip on New Hampshire Route 9 (NH 9) in the eastern part of Concord. Several times a year, I-393 also serves traffic to events at New Hampshire Motor Speedway in Loudon. I-393 runs concurrently with US Route 4 (US 4) and US 202 for its entire length.
New Hampshire Route 11 is a 108.223-mile-long (174.168 km) east–west state highway in New Hampshire, running completely across the central part of the state. Its western terminus is at the Vermont state line in Charlestown, where it continues west as Vermont Route 11. The eastern terminus is at the Maine state line in Rochester, where it crosses the border with U.S. Route 202 and continues as Maine State Route 11.
The Massachusetts State Highway System in the U.S. Commonwealth of Massachusetts is a system of state-numbered routes assigned and marked by the highway division of the Massachusetts Department of Transportation (MassDOT). U.S. Highways and Interstate Highways are included in the system; the only overlaps are with the end-to-end U.S. Route 3 and Route 3 and the far-apart Interstate 295, shared with Rhode Island, and Route 295, shared with New York State. A state highway in Massachusetts is a road maintained by the state, which may or may not have a number. Not all numbered routes are maintained or owned by the state.
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.
New Hampshire Route 9 is a 109.910-mile-long (176.883 km) state highway located in southern New Hampshire. It runs across the state from west to east and is a multi-state route with Vermont and Maine, part of 1920s-era New England Interstate Route 9.
In road transportation in the United States, a special route is a road in a numbered highway system that diverts a specific segment of related traffic away from another road. They are featured in many highway systems; most are found in the Interstate Highway System, U.S. highway system, and several state highway systems. Each type of special route possesses generally defined characteristics and has a defined relationship with its parent route. Typically, special routes share a route number with a dominant route, often referred as the "parent" or "mainline", and are given either a descriptor which may be used either before or after the route name, such as Alternate or Business, or a letter suffix that is attached to the route number. For example, an alternate route of U.S. Route 1 may be called "Alternate U.S. Route 1", "U.S. Route 1 Alternate", or "U.S. Route 1A". Occasionally, a special route will have both a descriptor and a suffix, such as U.S. Route 1A Business.
Highways are split into at least four different types of systems in the United States: Interstate Highways, U.S. Highways, state highways, and county highways. Highways are generally organized by a route number or letter. These designations are generally displayed along the route by means of a highway shield. Each system has its own unique shield design that will allow quick identification to which system the route belongs.
Media related to Interstate Highways in New Hampshire at Wikimedia Commons
