Abstract
Recently, many of the foreign traffic-safety analyses point out the low level of traffic safety in multi-lane roundabouts. This problem is resolved in several ways in different countries; however, the solution, whereby the number of conflict points is diminished (e.g. turbo roundabout) has proven to be the most successful. However, the turbo roundabout also has its deficiencies: it has conflict crossing points and larger reconstruction of the existing two-lane roundabout is needed when the turbo roundabout is to be implemented instead of the existing one. In the paper a new type of roundabout has been introduced; the roundabout with “depressed” lanes for right turning (“the flower-roundabout”). Financially speaking, the main advantage of the new type of roundabout is that it can be implemented within the dimensions of the already existing “normal” two-lane roundabout. From the traffic-safety point of view, the main advantage of the new type of roundabout is that it has no crossing conflict points. KEYWORDS: traffic safety, roundabout, turbo roundabout, roundabout with “depressed” lanes for right turn
Highlights
A growing number of foreign analysis point out to poor traffic-safety characteristics of “normal” multi-lane roundabouts and bad experiences related thereto [1]
Many countries are looking for a solution of what to do in these existing roundabouts, in order to improve the level of traffic safety [2, 3]
Results of the micro simulation show that there are no significant differences between the flower roundabout, normal and turbo roundabout, at low traffic loads
Summary
A growing number of foreign analysis point out to poor traffic-safety characteristics of “normal” multi-lane roundabouts and bad experiences related thereto [1]. For this reason, many countries are looking for a solution of what to do in these existing roundabouts, in order to improve the level of traffic safety [2, 3]. –– decreasing the number of driving lanes in the circulatory carriageway: not a good solution, because the roundabout capacity is decreased,. –– decreasing the number of driving lanes at entries/ exits: not a good solution, because the roundabout capacity is decreased,. One of the ways to decrease the number of conflict points is the turbo roundabout [4, 5]
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