Speed Reduction Effects of Urban Roundabouts

Dago Antov, Kristiina Abel, Peep Sürje, Harri Rõuk, Tiia Rõivas


Road safety is one of the most serious problems in road traffic in many countries, including the Baltic countries. One of the alarming issues in road safety is the safety on urban crossings. As the number of intersections is still in a very bad and unsafe shape, there is a big need to reconstruct these intersections in a modern way. Roundabouts are coming more and more popular in many countries of the world, and often they are considered to be as one of the basic intersection types in urban areas. In Estonia, as in most European countries, roundabouts have steadily become more and more popular during the last years especially because of the foreign experience – showing the excellent accident records, traffic performance, and traffic calming properties. But still some doubts have been encountered in Estonia regarding potential capacity restrictions, traffic restrictions for big trucks and buses and sometimes with traffic safety treatments for bicyclists, pedestrians and the disabled. No overall statistics regarding the present number, growth rate, and design of roundabouts in Estonia are available. The goal of this paper was to find which factors could affect the drivers’ speed choice at roundabouts. By the of obtained data we can follow up, that the main factor influencing the drivers’ speed choice is an inscribed circle diameter of the roundabout.


road safety; roundabout; speed

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Antov, D.; Rõivas, T.; Rõuk, H. 2007. Investigating drivers’ behaviour at non-signalised pedestrian crossings, The Baltic Journal of Road and Bridge Engineering 2(3): 111–118.

Brilon, W.; Vandehey, M. 1998. Roundabouts – the state of the art in Germany, ITE Journal 68(11): 48–54.

Daniels, S.; Nuyts, E.; Wets, G. 2008. The effects of roundabouts on traffic safety for bicyclists: an observational study, Accident Analysis and Prevention 40(2): 518–526. DOI: 10.1016/j.aap.2007.07.016

De Brabander, B.; Nuyts, E.; Vereeck, L. 2005. Road safety effects of roundabouts in Flanders, Journal of Safety Research 36(3): 289–296. DOI: 10.1016/j.jsr.2005.05.001

De Brabander, B.; Vereeck, L. 2007. Safety effects of roundabouts in Flanders: signal type, speed limits and vulnerable road users, Accident Analysis and Prevention 39(3): 591–599. DOI: 10.1016/j.aap.2006.10.004

Elvik, R. 2003. Effects on road safety of converting intersections to roundabouts. Review of evidence from Non-U.S. studies, Transportation Research Record 1847: 1–10. DOI: 10.3141/1847-01

Elvik, R.; Vaa, T. 2004. The handbook of road safety measures. 1st edition. Amsterdam: Elsevier. 1078 p. ISBN 0080440916

Garvill, J.; Marell, A.; Westin, K. 2003. Factors influencing drivers’ decision to install an electronic speed checker in the car, Transportation Research Part F: Traffic Psychology and Behaviour 6(1): 37–43. DOI: 10.1016/S1369-8478(02)00045-1

Hels, T.; Orozova-Bekkevold, I. 2007. The effect of roundabout design features on cyclist accident rate, Accident Analysis and Prevention 39(2): 300–307. DOI: 10:1016/J.AAP.2006.07.0098

Hydén, C.; Várhelyi, A. 2000. The effects on safety, time consumption and environment of large scale use of roundabouts in an urban area: a case study, Accident Analysis and Prevention 32(1): 11–23. DOI: 10.1016/S0001-4575(99)00044-5

Nilsson, G. 2004. Traffic safety dimensions and the power model to describe the effect of speed on safety. PhD thesis. Lunds Universitet, Tekniska Högskolan i Lund, Institutionen för Teknik och samhälle [Lund Institute of Technology, Dept of Technology and Society]. Bulletin 221. 121 p.

Persaud, B.; Retting, R.; Garder, P.; Lord, D. 2001. Safety effects of roundabout conversions in the United States: empirical bayes observational before-after study, Transportation Research Record 1751: 1–8. DOI: 10.3141/1751-01

Ratkevičiūtė, K.; Čygas, D.; Laurinavičius, A.; Mačiulis, A. 2007. Analysis and evaluation of the efficiency of road safety measures applied to Lithuanian roads, The Baltic Journal of Road and Bridge Engineering 2(2): 81–87.

Taekratok, T. 1998. Modern Roundabouts for Oregon [cited 15 May, 2008]. Available from Internet: .

Wegman, F. C. M.; Aaarts, L. T. 2005. Advancing sustainable safety national road safety outlook for 2005–2020 [cited 15 May, 2008]. Available from Internet: .

DOI: 10.3846/1822-427X.2009.4.22-26


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