Highway Engineering by Rogers Martin; Enright Bernard; & Bernard Enright

Author:Rogers, Martin; Enright, Bernard; & Bernard Enright [Rogers, Martin & Enright, Bernard]
Language: eng
Format: epub
Publisher: John Wiley & Sons, Incorporated
Published: 2016-06-20T00:00:00+00:00

The geometric guidelines for roundabout junctions are set out in TD 16/07 (DfT, 2007). While it is not proposed to go into detail on the geometric considerations that must be addressed when designing a roundabout, the following are brief notes from TD 16/07 regarding design of the following main parameters:

Entry width

Entry angle

Entry radius

Entry deflection

ICD

Circulatory carriageway

Main central island

Entry width

Entry width is a key factor affecting capacity. TD16/07 states that it is good practice to add one or two extra lanes on the entry approach. However, as a general rule, not more than two lanes should be added and no entry should be more than four lanes wide. (At all entry arms in the above example, one lane has been widened to two at the entry point.)

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