A Case Study Analysis of Roundabouts Entry Capacity Localised on One of the Main Road in Sosnowiec City (Poland)

Abstract

This paper is a case study, which among other things includes the analysis of the three roundabouts entry capacity: a turbo-and two spiralroundabouts. These intersections are located in one of the main road localised in Sosnowiec city (Poland). Before reconstruction, this road was characterised by unfavourable road and traffic conditions, insufficient capacity and low traffic safety level. The traffic congestion decreased significantly, traffic and road conditions, as well as the level of road traffic safety, were improved after the rebuilding of this route and the designing of three roundabouts on it. Results obtained from field measurements enabled comparative analysis of theoretical and empirical capacity values: lanes on the entry of turbo-roundabout and entries of the spiral-roundabout. This paper presents also characteristics of turbo-and spiralroundabouts with methods, which are dedicated to entry capacity calculation.

Comparison of Traffic Flow Characteristics of Signal Controlled Intersection and Turbo Roundabout

“…After rebuilding the analysed road and designing turbo roundabout, the congestion of traffic flow significantly decreased. Moreover, the traffic and road conditions and the level of traffic safety were considerably improved [15]. Fortuijn (2009) found out that turbo roundabouts provide higher capacity than two-lane conventional roundabouts, due to both raised lane dividers and spiral markings, which in turn result in better use of the inner lanes of the turbo roundabout [6,7].…”

Driver’s distraction and its potential influence on the extension of reaction time

“…In the literature, the issue of transport safety is widely described and covers many aspects. There are studies on accident statistics [10,27,28], vehicle safety design [23,36], vehicle safety systems [5,8,14], transport infrastructure [11,24,44], traffic flow [2,20,21], driving techniques [30,37,40], issues related to transport psychology [22,26], legislative issues [1,7,33] or transport safety management systems [17,35,38].…”

Study of eco-driving possibilities in passenger car used in urban traffic

“…One of the trends of the last decade has been a significant increase in road traffic [30]. The road network of each city consists of various types of intersections, which enable the handling of collision traffic flows and which can be bottlenecks of the transport system [27]. Because of the narrow streets and the density of the existing buildings within the city, in most cases it is not possible to extend current infrastructure [20].…”