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Slovenian experiences with alternative types of roundabouts - "turbo" and "flower" roundabouts
Tollazzi, Tomaž ; Renčelj, Marko, 1973- ; Turnšek, Sašo
The idea of roundabouts with the spiral course of the circulatory carriageway ( "turbo-roundabouts") was very rapidly - already in 2002 - transposed into the Slovenian environment as well. There are ...more reasons for that. One of the most important reasons is surely the fact that in the past, too small two-lane roundabouts were being constructed in Slovenia. The second reason is that the inner circulatory traffic lane in the circulatory carriageway is not "interesting" for the young and the senior traffic participants, because they feel insecure, when they change lanes. Currently, the conditions in Slovenia are the following: there are five implemented roundabouts with the spiral course of the circulatory carriageway, two roundabouts of this type are under construction, for three roundabouts of this type, the project documentation is in the stage of confirmation and also Slovenian guidelines for the planning of roundabouts with the spiral course of the circulatory carriageway were adopted. All five of the Slovenian turbo roundabouts are subjected to monitoring and analyses of their operation, since they are still "fresh" and we cannot yet guarantee that they shall be as successful as in the Netherlands. Nevertheless, in two out of five Slovenian turbo roundabouts we notice hesitance of drivers, when they enter the roundabout on the inner entry traffic lane. The fact is that in both cases, the driver at this traffic maneuver crosses a very strong traffic flow and enters the second, equally strong traffic flow, which causes a sense of insecurity and danger with the driver. Therefore, the crossing conflict points in the turbo roundabout have a significantly larger negative effect than was expected (at least at the beginning of the introduction). The solution of this problem is the roundaboutwith "depressed" lanes for right-turners - "flower-roundabout".
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