Study Of Operating Speed Prediction Model For Passenger Cars In Tunnel Of Expressway

In recent years, with the rapid development of construction of western expressway, the proportion of tunnel is gradually increasing. According to the statistical analysis, the ratio of accidence happened in tunnels is higher than other sections significantly. Especially the accidences happened in entrance and exit of tunnels is much more in internal of tunnels. The safety evaluation of tunnel section is concerned increasingly. While the operating speed has not regulated in Guidelines for Safety Audit of Highway. Therefore studying on the prediction model of operating speed of tunnel section is especially important.Firstly, the influence factors of speed in tunnel are analyzed from four aspects, which including drivers, vehicles, roads and traffic environment. The continuous speed in tunnels of different length is investigated by using non-contact device to meet the need of division of expressway tunnels and modeling. Then according to variation of speed, this paper divides longer and longest tunnel to seven sections and survey the speed on that seven feature points, final to ascertain v85 of each characteristic point.Secondly, under the analysis of the growing trend of speed in tunnel, this paper chooses eleven dependent variables from spatial structure of road and traffic environment, and figure up each variables, then analysis the influence of single factor to speed to building the model from operating speed and each variable. And tested the variable whether effected operating-speed significantly. Selected the factors that affect operating speed greatly and non collinear, and brought it in multiple regression to building the model of operating speed in tunnel. Finally, figure up the parameters of model.Finally, chose the tunnel of xi-han expressway, figure the parameters of operating speed model of fourth chapter. The established model fitted on the tunnel road speed better, so the ideas and method was available.