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| NHDOT Bureau of Highway Design |
Room 200
John O. Morton Building
7 Hazen Drive
Concord, NH 03302 |
Craig Green, Administrator
(603) 271-2171 |
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| Roundabout Information |
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| In 1903 the Columbus Circle opened in New York City, this was the first traffic circle to be built in the United States. Traffic Circles were constructed in New Hampshire from about the 1940’s to 1960’s. They fell out of favor beginning in the 1960’s because they relied on high speed merging of traffic and the traffic in the circle yielded to traffic entering causing traffic jams. While traffic circles fell out of use in the US many European countries modified the design and eventually created the modern roundabout. The modern roundabout has since gained renewed interest in the US because of the safety benefits, high capacity, traffic calming affect, and aesthetic value they can bring to an intersection.
The information below is intended to answer some common questions and provide additional information to communities and the general public as to what roundabouts are and how they operate.
Also included are NHDOT roundabout design guidelines that supplement the FHWA Roundabout Guide.
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Plymouth Main Street roundabout opened in 2007 |
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Brochures:
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Design Information:
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| Simulations: |
Private Roundabout Web Site Links: |
| Informational Posters: |
Additional Web Site Links: |
| Photos of Roundabouts in New Hampshire |
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Nashua - Main Street - 1 | 2 | 3 |
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Nashua - Broad Street - 1 | 2 | 3 |
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Meredith - US 3 at Parage Road - 1 | 2 | 3 |
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Plymouth - US 3 at NH 175A - 1 | 2 | 3 |
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Hanover - NH 10 - 1 | 2 | 3 | 4 |
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Keene- Court Street - 1 | 2 |
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Keene - NH 101 at Winchester Street - 1 | 2 | 3 |
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