Abstract
The article presents the results of preliminary research into the behaviour of drivers at turbo-roundabouts. The subject of the research included the frequency of driver behaviour against the traffic rules, and the speed at which vehicles drive through turbo-roundabouts. One of the crucial problems which was analysed was the influence of different kinds of traffic lane division on the behaviour of drivers. The analysis results affirm that the raised lane dividers can visibly improve the propensity of drivers to stay within the designated traffic corridor. However, it does not eliminate the phenomenon of improper lane changing on circulatory roadway. The physical separation of traffic lanes has not been determined to introduce any additional hazard. The speed of vehicles encroaching upon the neighbouring traffic corridor is visibly higher than this of vehicles following traffic rules. Using crash prediction models developed for single- and multi-lane roundabouts, the authors of the research estimated that lane dividers may reduce the number of crashes from about 10% to 17%.
Highlights
Road intersections are one of the most demanding elements of road infrastructure to design
One of the conclusions was that the level of road safety in turbo-roundabouts with no physical separation between traffic lanes was similar to multi-lane roundabouts, while using raised dividers improved safety
The turbo-roundabouts which are being built in Poland create an opportunity to improve the traffic performance and road safety in critical points of the road network
Summary
Road intersections are one of the most demanding elements of road infrastructure to design. Multi-lane roundabouts provide a higher capacity, the number of accidents as well as Property Damage Only accidents (PDO) is visibly larger than in the case of single-lane ones It is the result of the geometric layout, which leads to higher speeds and especially lane change manoeuvres within the circulatory roadway of the roundabout corresponding to the higher number of collision points. Roundabouts design Turbo-roundabouts are a specific type of multi-lane roundabouts which allow passing through the intersection in given directions in one or more lanes without the necessity to change lanes They are characterised by a smaller number of collision points due to the elimination of weaving manoeuvres on the roundabout's roadway. Physical separation of traffic lanes supports the improved clarity of a roundabout as well as keeping vehicles in their lane
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