Simulation of traffic conflicts at unsignalized intersections with TSC-Sim

Area of Science:

• Traffic Engineering
• Transportation Safety
• Computer Simulation

Background:

• Unsignalized intersections pose unique safety challenges due to complex driver interactions.
• Existing models often lack detailed analysis of driver behavior and its impact on traffic conflicts.
• Assessing safety performance at unsignalized intersections requires advanced simulation tools.

Purpose of the Study:

• To develop and validate a computer simulation model for analyzing traffic conflicts at T and 4-leg unsignalized intersections.
• To investigate the influence of driver characteristics (age, sex, waiting time) and traffic parameters (volume, speed) on conflict occurrence and severity.
• To provide a graphical display for visualizing critical traffic conflict events and associated variables.

Main Methods:

• Developed a traffic conflict simulation model incorporating extended gap acceptance criteria.
• Integrated driver characteristics and traffic parameters into the simulation.
• Employed importance sampling technique and stored conflict data for analysis.
• Utilized graphical animation for conflict visualization.
• Validated model results against field observations from four unsignalized intersections.

Main Results:

• The simulation model successfully replicated traffic conflict scenarios at unsignalized intersections.
• Driver and traffic parameters were shown to significantly affect the number and severity of traffic conflicts.
• Model predictions showed reasonable correlation with real-world conflict observations.
• The graphical display effectively illustrated conflict events and critical variable values.

Conclusions:

• The developed traffic conflict simulation model provides a valuable tool for assessing safety at unsignalized intersections.
• The model's ability to incorporate driver behavior enhances its utility for studying critical-event traffic situations.
• Findings support the use of this simulation for evaluating safety performance and potential solutions for various unsignalized intersection designs.