U.S. Route 1 Bypass (New Hampshire)
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| Route information | |
| Bypass of US 1 | |
| Length: | 4.3 mi (6.9 km) New Hampshire: 2.756 miles (4.435 km) Maine: 1.6 miles (2.6 km) |
| Major junctions | |
| South end: |
 US 1 in Portsmouth, NH
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    I‑95 / US 4 / NH 16 / Spaulding Turnpike in Portsmouth, NH
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| North end: |
US 1 in Kittery, ME
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| Location | |
| Counties: | Rockingham (NH), York (ME) |
| Highway system | |
U.S. Route 1 Bypass is a 4.3-mile (6.9 km) long bypass of U.S. Route 1 in Portsmouth, New Hampshire and Kittery, Maine. Most of its north section, northeast of the Portsmouth Circle where it meets the Blue Star Turnpike (Interstate 95) and Spaulding Turnpike, is built to rudimentary freeway standards, with no cross traffic but driveway access. The southern portion is similarly constructed, although there are two four-way intersections with traffic lights just south of the circle and a third at its south end, just before intersecting with US 1.
US 1 Bypass begins at US 1 (Lafayette Road) south of downtown Portsmouth. Formerly a half-interchange with limited access and a flyover ramp, the old interchange was converted to a standard three-way intersection with full access in 2013. US 1 Bypass heads northwest (with NH 33 passing over without an interchange) and continues to the west of the city. It has two at-grade intersections with Borthwick Avenue and Coakley Road/Cottage Street before it comes to a large rotary, the Portsmouth Traffic Circle, where it interchanges with Interstate 95 and the southern end of the Spaulding Turnpike/NH 16 (which is also the eastern terminus of U.S. Route 4). US 1 Bypass enters the circle from the southeast and leaves via the first exit, turning to the northeast towards Maine.
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