Traffic Risk Assessment of Freeway On-ramp and Off-ramp Areas Based on Simulation Analysis

摘要

In order to improve safety of Freeway onramp and off-ramp areas, through the analysis of operating characteristics of traffic flows and accident causes on freeway on-ramp and off-ramp areas, the risk level was changed from two-dimension vector to one-dimension variable based on the critical deceleration and unsafe degree. The deceleration risk and unsafe density parameter as traffic risk assessment index were put forward, then the traffic risk quantitative assessment models were established. According to the safety risk management theory, the risk classification description and assessment were built up. Applying the microscopic traffic simulation technique, the suggested values of the traffic control standard of on-ramp and off-ramp areas were also proposed. At last, the examples were made a risk analysis through simulating the traffic flows. The results suggested that the traffic risk assessment index and the assessment method are accurate and effective, which can supply the theoretical basis for the establishment of the dynamical traffic control and management measures.