线形受限地下快速路交通运行特性研究

Research on Traffic Operation Characteristics of Restricted Linear Underground Expressway

摘要:

针对苏州独墅湖南隧道接线（NE匝道）大纵坡接小半径不利线形组合及NE与S1匝道合流区“左进”错觉等不利线形条件，采用驾驶模拟试验，建立地下快速路匝道及合流区的模拟场景，继而进行匝道及合流区的速度轮廓、纵向加速度标准差和横向偏移分析。结果表明：NE匝道速度方差较大，存在行驶安全风险；NE与S1匝道合流区存在频繁的加减速操作，可能造成合流区的安全隐患。通过设置减速标线、限速标志及轮廓标可提高行驶安全性，改善车辆横向偏移。

Abstract:

A driving simulation test is carried out to solve the unfavorable linear combination of large longitudinal slope and small radius in Suzhou Dushu Lake South Tunnel Connection (NE Ramp) and the illusion of "left approach" in the confluence area of NE and S1 ramps. A simulation scenario of underground expressway ramp and confluence area is built to analyze the velocity profile, longitudinal acceleration standard deviation and lateral migration in ramps and confluence areas. The results show that the velocity variance of NE ramp is large, which has a driving safety risk. There are frequent acceleration and deceleration operations in the confluence area of NE and S1 ramps, which may cause the safety risks in the confluence area. The driving safety and lateral migration of vehicles can be improved by setting the deceleration marks, speed limit signs and contour marks.