Roundabout Interchange

A roundabout interchange is a type of interchange between a controlled access highway such as a motorway or freeway, and a minor road, in which the slip roads to and from the motorway carriageways converge at a single roundabout, which is grade-separated from the motorway lanes with bridges. A roundabout interchange is similar to a rotary interchange, which uses a rotary rather than a roundabout. Roundabouts may also be used in conjunction with other interchange types such as a standard or folded diamond interchange, though such use should not be confused with a roundabout interchange.

Roundabout interchanges are extremely common in the United Kingdom, with hundreds on the motorway network alone. However, recent cost-cutting has meant that "dumbbell interchange" are increasingly used instead. These are essentially diamond interchanges with roundabouts instead of signals or stop signs where the slip roads meet the minor road. They are cheaper than roundabout interchanges as only one bridge is required instead of two. Roundabout interchanges are much less common in North America, but have been built more frequently since 1995, to improve safety, and to reduce traffic delays and bridge widening costs. However, and conversely, many of the older and more dangerous rotary-style overpass interchanges have been signalized to improve throughput and safety, such as the Drum Hill Rotary in the New England state of Massachusetts, where such interchanges are unusually commonplace.

A "divided diamond," where the minor road is separated into four intersections, rather than two, also acts like a roundabout interchange, however is more square in shape, and typically has traffic light control.

Read more about Roundabout Interchange:  Examples, Three-level Stacked Roundabout

Other articles related to "roundabout interchange, roundabout, interchange, roundabouts":

Roundabout Interchange - Three-level Stacked Roundabout
... The three-level stacked roundabout is a variation on the roundabout interchange in which both roads are grade-separated ... It is similar to the three-level diamond interchange except that the small square of that latter interchange is enlarged to a true roundabout ... A5), Dollis Hill, Greater London, has the roundabout on the ground Three-level stacked roundabouts are quite common in Britain because they use less land than other four-way junctions where ...
List Of Road Junctions In The United Kingdom: Q - Q
... SX456671 Queen Eleanor Interchange Roundabout Interchange Northampton A45 Nene Valley Way A45 Mere Way A508 London Road B526 Newport Pagnell Road Hardingstone Lane SP756580 The name is a ...
List Of Road Junctions In The United Kingdom: H - H
50.98472°N 0.92194°E / 50.98472 0.92194 Hampton Court Roundabout Hampton, LB Richmond upon Thames A308 Hampton Court Road A309 Hampton Court Bridge 51°24′18″N 0°20′30″W. 2°38′59″W / 54.50833°N 2.64972°W / 54.50833 -2.64972 Hardwick Roundabout Roundabout Interchange King's Lynn, Norfolk A10 A47 A149 52°44′10″N 0°25′03″E / 52.73611°N 0.417. 0°16′20″W / 51.54472°N 0.27222°W / 51.54472 -0.27222 Hartshay Hill Roundabout Ripley, Derbyshire A38 A610 B6441 Hartshay Hill SK391513 Hartspring Roundabout Watford ...
List Of Road Junctions In The United Kingdom: S - S
... Frith Street SD570051 Sadlers Hall Farm Magic Roundabout North Benfleet, Essex A13 A130 B1464 London Road (formerly A13) TQ763884 A 'magic roundabout ... Partially built roundabout used to access Scratchwood services. 55.85 -4.27833 Segensworth Roundabout Segensworth, Hampshire A27 M27 J9 Link Road A27 Southampton Road Segensworth Road Little Park Farm Road Barnes Wallis Road ...
List Of Road Junctions In The United Kingdom: 0-A - A
... Junction Name Type Location Roads Grid Reference Notes Abbey Hill Interchange Roundabout Interchange Wymbush, Milton Keynes A5 H3 (A422) Monks Way V5 Great Monks Street 52°02′51″N 0°48′16 ... SX776714 Amwell Roundabout Roundabout Great Amwell, Hertfordshire A414 Stanstead Abbotts Bypass Road A414 Link Road A1170 (formerly A10) Ware Road A1170 (f ... formerly A303) A357 Lawrence Hill ST697273 The Angel, Edmonton Diamond Interchange Edmonton, LB Enfield A406 Stirling Way A406 Angel Road A1010 Fore ...

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