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为准确预测高速公路运行车速,以平、纵线形综合指标为主,横断面线形指标作为修正的方式,考虑桥梁、隧道等结构物的影响,建立包括曲率、曲率变化率、曲线转角、纵坡度、车道宽度等指标的公路线形三维空间综合指标描述函数;注重运行车速的连续性变化及驾驶员视觉需求,确定车辆行驶中前方100 m至250 m有效注视范围为前方线形对车速的影响范围;根据车辆加减速性能,确定后方200 m加减速长度范围为后方线形对车速的影响范围;通过对前、后线形影响范围内公路线形综合指标的累积效果与运行车速的相关性分析,建立高速公路线形三维空间综合指标与运行车速的关系模型,应用结果表明关系模型适用于我国高速公路的连续性预测。
In order to accurately predict the running speed of expressways, the linear and longitudinal profiles are the main indicators, and the cross-sectional linear indicators are used as the corrections. Considering the influence of bridges, tunnels and other structures, a set of parameters including curvature, rate of change of curvature, curve angle, , Lane width and other indicators of the road linear three-dimensional composite index description function; pay attention to the continuity of the running speed changes and the driver’s visual needs to determine the vehicle ahead of 100 m to 250 m effective range of attention for the front line of the impact on the speed range; According to the vehicle acceleration and deceleration performance, the range of 200 m acceleration / deceleration at rear is determined as the influence range of rear line to vehicle speed. Through the analysis of the correlation between the cumulative effect of highway alignment and the running speed in the front and back line, The relationship model between the comprehensive index of linear three-dimensional space and running speed is shown. The application results show that the relation model is suitable for the prediction of continuous highway in our country.