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A typical longabout - as seen on the A414 at Colney Heath
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A longabout is a form of dumbbell roundabout junction where the link road connecting the two roundabouts is dual carriageway and the central reservation of the link road joins up with either or both of the centre islands. They are often used to avoid having two separate roundabouts close to each other on a main road where the side roads have relatively low flows.

Examples of longabouts can be found at:

Junction Types
Cloverleaf • Crossroads • CYCLOPS • Diamond • Directional T • Diverging Diamond • Dumbbell • Fiveways • Four Level Stack • Grade separated • Gyratory • Hamburger Junction • LILO • Longabout • Magic Gyratory • Magic Roundabout • Parclo • Roundabout • Roundabout interchange • Single Point Urban Interchange • Single sliproad junction • T Junction • Trumpet Junction • Whirlpool

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