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Unsignalized intersection presents the highest amount of serious potential conflicts between road users. Safety at such intersections is a worldwide concern, especially in the developing countries like India where unsignalized intersections essentially function as uncontrolled ones due to the high prevalence of indiscipline traffic maneuverability. Recently, there has been a growing interest in using microsimulation models for the safety assessment of any road network by analyzing vehicle trajectories and estimating proximal safety indicators. Hence, the aim of this study is to evaluate safety at four unsignalized intersections located at National Capital Region (NCR), India using the widely used microsimulation model PTV VISSIM. Initially, safety evaluation has been carried out using two proximal indicators, Post Encroachment Time (PET) and Conflicting speed. Later, several traffic calming and management measures have been utilized in order to improve the safety of the selected study sites in VISSIM. Consequently, their effect on base mean PET is obtained using an add-in software Surrogate Safety Assessment Model (SSAM). The study results show that increase in overall traffic volume, reduction in heavy vehicle volume, increase in grade up to 4 percent gradient have resulted into increased safety level at the selected intersections. Speed calming measures such as speed humps and speed tables are also found to be effective by increasing safety at selected intersections. The present study shows that integration of proximal safety indicator in conjunction with traffic simulation model identifies different efficient traffic calming and management measures in order to increase the safety of traffic networks.

This paper was sponsored by TRB committee ANB20 Standing Committee on Safety Data, Analysis and Evaluation. Alternative Title: Traffic Calming and Management-Based Safety Enhancement at Unsignalized Intersection Using Microsimulation

18-02421

English

15p

2018

Transportation Research Board 97th Annual Meeting

Digital/other

Figures; References (18) ; Tables

Developing countries; Highway safety; Microsimulation; Traffic calming; Traffic conflicts; Traffic volume; Unsignalized intersections

India

Highways; Operations and Traffic Management; Safety and Human Factors

Transportation Research Board Annual Meeting 2018 Paper #18-02421

TRIS, TRB, ATRI

Jan 8 2018 10:35AM