Safety analysis of main line under different traffic conditions in expressway confluence area

In order to explore the safety of the mainline in expressway confluence area, firstly, based on the traffic data and related research, the relationship between average speed and accident rate of the inner lane and the middle lane is analyzed by using statistical methods, then, combined with models of average speed-accident rate, Greenberg and Underwood, traffic density-accident rate models(AR-k) of inner lane and middle lane with larger and smaller traffic density k are constructed respectively, and then, influence of k of two lane and cumulative number of vehicles n on traffic safety is analyzed from the qualitative and quantitative point of view, results show that that n and k have a great influence on AR no matter in which lane and whether k is small or large. Finally, some measures to improve traffic safety are put forward from two aspects of controlling traffic volume and limiting the speed in confluence area. © 2022, Jilin University Press. All right reserved.