1. 4) Maycock, G. and Hall, R. D. : Accidents at 4-arm roundabouts, Transportation Research Laboratory Report LR1120, 1980.
2. 5) Arndt, O. K. and Troutbeck, R. J. : Relationship between roundabout geometry and accident rates, Transportation Research Circular, Vol. 28, pp. 1-16, 1998.
3. 6) Transportation Research Board : NCHRP Report 572 Roundabouts in the United States, 2007.
4. 7) Transportation Research Board : NCHRP Report 672 Roundabouts; An informational guide, 2nd edition, 2010.
5. 8) Vereinigung Schweizerischer Strassenfachleute : Schweizer Norm SN 640 263, Knoten mit Kreisverkehr, 1999.