New Jersey Route 31
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| Route 31 |
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| Length: | 48.93 mi[1] (78.75 km) | ||||||||
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| Formed: | 1967 | ||||||||
| South end: |  US 206 in Trenton |
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| Major junctions: |
 I-95 in Hopewell US 202 in East Amwell Twp NJ 12 in Flemington  I-78/US 22 in Clinton Twp NJ 57 in Washington |
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| North end: |  US 46 in White Twp |
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Route 31 is a 48.93-mile (78.75 km) state highway in New Jersey, United States, running from Trenton north via Flemington, Clinton and Washington to Buttzville in White Township. The highway's southern terminus is at U.S. Route 206 (also signed as U.S. Route 1 Business) in Trenton; its northern terminus is at U.S. Route 46. Most of the highway is state-maintained; the section within the city limits of Trenton, however, is maintained by Mercer County.
Most of NJ 31 is a two-lane country road, except for six miles in Hunterdon County, where it is concurrent with U.S. Route 202. In some places, the two lanes became four by eliminating the shoulders along the side of the road. In recent years, NJ 31 has seen extensive construction projects between Flemington and Clinton, with gradual widening to four lanes.
 The proposed Route 31 bypass of Flemington |
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[edit] History
The Trenton-Buttzville route was defined as an unnumbered state highway in 1924, and in the 1927 renumbering it was assigned the Route 30 number. Except for the bypasses around Pennington and Ringoes, the route was taken over in stages from 1927 to 1932, and the Pennington bypass was built ca. 1935.
In 1927, a Route 31 was also defined, running from Princeton to the New York state line. This became parts of U.S. Route 206 (south of Newton) and Route 94 (north of Newton) in the 1953 renumbering; see those articles for details. The section of US 206 north of Newton was also designated Route S31, this designation was also dropped in the 1953 renumbering.
In the 1953 renumbering, Route 30 was renumbered Route 69, as the number conflicted with U.S. Route 30. The bypass of Ringoes, shared with U.S. Route 202, opened ca. 1965. Due to the sexual meaning of the number and resulting sign theft, the number was changed on May 15, 1967 to Route 31.
