In a comprehensive review of roundabouts it could firstly be beneficial to look at their origins. The conventions or rules of usage are as important as the layout. The history of roundabouts shows that these conventions must be conveyed by clear signs and warnings, and by the indications implicit within the layout. If this is done well then drivers will respond logically including moderating their speed.
CITATION STYLE
Tollazzi, T. (2015). Origins of roundabouts. In Springer Tracts on Transportation and Traffic (Vol. 6, pp. 1–9). Springer International Publishing. https://doi.org/10.1007/978-3-319-09084-9_1
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