Research on Traffic Efficiency of Freeway On-Ramp Based on the Operational Characteristics of Vehicular Flow

In order to research the operation law of the expressway on-ramp, this paper analyzed its traffic efficiency. Firstly, this paper analyzed the traffic operational characteristics of the mainline traffic and ramp traffic of the freeway on-ramp. It can be known that the distribution law of time headway of the traffic flow outside the mainline obeys the 3rd order Erlang distribution. On this basis, the traffic efficiency model of the on-ramp confluence area is established based on the acceptable gap theory. This paper verified and analyzed the established model based on the actual survey data. The results showed that the average error of the model is 11.74%, which is within an acceptable range. Finally, this paper analyzed the influence of different critical gap and car following time on traffic efficiency. It validated the viability of the model.