U.S. Route 1 Bypass (Maine)
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| Route information | |
| Bypass of US 1 | |
| Length | 4.32 mi (6.95 km) |
| Existed | 1940 – present |
| 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 (US 1 Byp.) is a 4.3-mile-long (6.9 km) bypass of U.S. Route 1 in Portsmouth, New Hampshire and Kittery, Maine. Most of its north section, northeast of the Portsmouth Traffic Circle where it meets the Blue Star Turnpike (Interstate 95 or I-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 and 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 I-95 and the southern end of the Spaulding Turnpike/New Hampshire Route 16 (NH 16) and the eastern terminus of US 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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