弯道建议速度标志的研究

Research on Advisory Speed Limit Signs

建议速度是用来提醒司机通过弯道或其他特殊道路条件时最大的推荐速度,可以引导司机在危险点处选择安全车速。目前在城市快速路匝道以及小半径弯道的入口限速标志通常采用单一的限速值,由于限速值过低,实际的运行速度远远高于限速值,导致安全事故的频发。利用高精度车载GPS对小客车在不同弯道半径下的运行速度进行采集,建立距离与运行速度的预测模型;以实际运行速度的85%作为建议速度值,并给出建议速度标志的设置间距。通过驾驶模拟舱设置相应场景进行仿真,仿真结果显示,当弯道上连续设置建议速度标志时,可以有效降低车辆的实际运行速度。

Advisory speed is used to indicate the recommended maximum speed in good driving conditions when drivers drive through curves or roads with special conditions. It can guide the driver to select safe speed at the danger point. So far, speed limit value at the ramp entrance of urban expressway or curve with small radius are set by the same value which is too low in China. In fact, the operating speed is easy to exceed the safety design speed so as to lead to traffic accidents. In this paper operating speeds of ramp with different radius are collected by high precision GPS and the operating speed and distance prediction model is established. At last 85 % percentage of operating speed is recommended as the advisory speed and spacing-set are proposed. After simulating the scenario, it is found that advisory speed signs can effectively reduce the operating speed.