Abstract
Turbo roundabouts are lately a more common choice in designing multilane roundabouts. First guidelines for geometric design of this particular roundabout layout were developed by a Dutch Information and Technology Platform CROW in 2008. Soon after, a number of European countries began to develop their own regulations on turbo roundabouts, adjusted to their traffic cultures and their local conditions. In order to present the diversity of design approaches for turbo roundabout planning in various European regions, comparative analysis of turbo roundabout design procedures described in Slovenian technical specifications, Serbian design manual, German working document, and Croatian and Dutch guidelines is made. Relevant influential parameters used in these procedures are commented. Study presented in this paper may contribute to the success of turbo roundabout planning procedure.
Highlights
A number of studies have shown that standard multilane roundabouts with concentric circulatory lanes have lower practical capacity compared to the predicted, and a frequent occurrence of traffic accidents [1÷3]
Turbo roundabout is a specially designed multilane roundabout with spiral circulatory roadway, where the traffic flows at the entrance, circulatory roadway and exit are physically separated by raised mountable lane dividers [5]
Turbo roundabout geometric design was considered in a number of other studies [1, 16÷19], which were generally focused on analysis of Dutch turbo roundabout geometry and presentation of new design approaches
Summary
A number of studies have shown that standard multilane roundabouts with concentric circulatory lanes have lower practical capacity compared to the predicted, and a frequent occurrence of traffic accidents [1÷3]. The reasons for this are high driving speeds and large number of potential conflicts at roundabout multilane entrances, exits and circulatory roadway. Turbo roundabout geometric design was considered in a number of other studies [1, 16÷19], which were generally focused on analysis of Dutch turbo roundabout geometry and presentation of new design approaches These new approaches, which are based on a Dutch design procedure, are described in national regulations of several European countries. Considering the fact that local traffic conditions and driving behaviours differ from country to country, other countries began developing their own regulations, adjusted to their driving standards, drivers’ habits, and winter maintenance requirements
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