Abstract
The European Union policy strategies on the sustainability of the transport system pursue the goals of maximizing safety and environmental benefits and reducing the severity and frequency of crashes, congestion, and pollutant emission rates. A common issue is the planning of the most effective solution for operational and safety management at intersections. In this study, an egg turbo roundabout is proposed as the alternative solution to a conventional roundabout in Southern Italy which suffers from traffic congestion. A comparative analysis is carried out using microsimulation techniques to investigate the safety effects and operational improvements of converting a traditional priority intersection into standard roundabout or turbo roundabout layout. In particular, the VISSIM software is used to explore the most relevant operational performance measures: queue length, travel times and delays. The lowest values of these measurements are recorded for the simulated turbo roundabout, thus making this scheme more appropriate in terms of operational performances. With regard to safety analysis, the Surrogate Safety Assessment Model (SSAM) is used to collect information on the predicted number of conflicts, the probability, and severity of the potential collisions. The results suggest that, for the specific case study, the safety levels of the standard roundabout and the turbo roundabout are approximately comparable.
Highlights
The recent European policy strategies on sustainability of the transport system pursue the goal of a mobility based on safety, connection, and air quality [1]
Road safety management plans are primarily aimed at improving the safety levels of the road transport system, reducing the severity and frequency of crashes, being strictly related to the high priority of minimizing the social and economic costs associated with traffic accidents
Procedure carried out toimplemented calibrate thehas microsimulation model, following the
Summary
The recent European policy strategies on sustainability of the transport system pursue the goal of a mobility based on safety, connection, and air quality [1]. EU legislative initiatives for the decade 2021 to 2030 contribute to the development of mutual relationships between safety and sustainability measures with the purpose of increasing the safety potential and reducing both congestion and pollutant emission rates [2]. The highest social costs are associated with the road transport system: traffic accident occurrence, congestion phenomena, and the emission of air pollutants are the most relevant issues [3]. Road safety management plans are primarily aimed at improving the safety levels of the road transport system, reducing the severity and frequency of crashes, being strictly related to the high priority of minimizing the social and economic costs associated with traffic accidents. The presence of several conflict points and the absence of adequate forms of speed control translate into the transformation of intersections in accident hotspots
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