Speed reduction effects of urban roundabouts

Abstract

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.

Estimating the parameters of Cowan’s M3 headway distribution for roundabout capacity analyses

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Mathematical Modelling of Network Traffic Flow

“…It also encounters diffi culties in choosing an appropriate method of deriving physical appearance we can notice on our streets and roads. Diff erent authors have diff erent views to the same phenomena and are focusing on diff erent aspects of the same problem Berezhnoy et al 2007;Akgüngör 2008a and2008b;Daunoras et al 2008;Yousefi and Fathy 2008;Gowri and Sivanandan 2008;Burinskienė 2007 andAntov et al 2009, Knowles 2008Gasser 2003;Helbing and Greiner;Knowles 2008 etc. ).…”

Finding a Solution for a Complex Street Routing Problem Using the Mixed Transportation Mode

“…e reported results are abstracted and do not consider several very special issues. e problem of postal delivery optimization can be modelled by Street Routing Problems (SRP) and Capacitated Vehicle Routing Problems (CVRP) (Matis 2007 andJanáček 2003;Janáček and Gábrišová 2009;Antov et al 2009;Çalışkanelli et al 2009;Jovanović et al 2009;Bogdevičius 2007, 2009;Szűcs 2009;Turskis et al 2009;Baublys 2008;Brauers et al 2008;Daunoras et al 2008;Gowri and Sivanandan 2008;Niewczas et al 2008;Tanczos and Torok 2007;Ziari et al 2007;Poot et al 2002).…”