Nov tip krožnega križišča: krožno križišče s pritisnjenimi pasovi za desne zavijalce - "flower roundabout"
New type of roundabout: roundabout with depressed lanes for right turning - "flower roundabout"

slovenian

2011

volume 60, issue 6

Zveza društev gradbenih inženirjev in tehnikov Slovenije
(Obvezni izvod spletne publikacije)

Recently, many of the foreign traffic-safety analyses have pointed out the low level of traffic safety in the multi-lane roundabouts. Weaving in the circulatory carriageway or changes of traffic lanes have been particularly at issue, however, they are essential for the exploitation of all circulatory traffic lanes, whereby the maximum capacity of the multi-lane roundabout can be achieved. The problem of low traffic safety in the multi-lane roundabouts is solved in various ways in different countries - however, the solution, whereby the number of conflict points is diminished had proven to be the most successful. The roundabout with the spiral course of the circulatory carriageway (or the turbo roundabout) is a type of roundabouts, which significantly diminishes the number of conflict points. However, the turbo roundabout also has its deficiencies. From traffic safety point of view, the turbo roundabout has conflict crossing points, where the consequences of traffic accidents are the worst. In addition, the reconstruction of existing two-lane roundabout to the turbo roundabout is financially demanding - we needlarger construction works to be done (demolition / displacement of the existing road curbs, transpose dividing islands and public lightning etc.). Inthis paper, we introduce a new type of roundabouts, the roundabout with "depressed" lanes for the right turning or so-called "the flower-roundabout." Financially speaking, the main advantage of the new type of the roundabout is its possibility to 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.

17.03.2014