城市道路绿化对行车视线诱导的植物合理种植间距

【目的】规范城市道路绿化交通安全功能,提高绿化植物对行车视线诱导的可靠性。【方法】通过驾驶员视觉特性分析,根据《城市道路工程设计规范》(CJJ 37—2012),以双向四车道为基本线型,构造两个数学模型; 一个是在不同设计速度下形成连续景观的直线段模型,另一个是在不同设计速度下形成最佳曲线曲率感知效果的曲线段模型。【结果】在道路直线段,车速分别为30、40、60、80、100 km/h时,使驾驶员形成连续景观感受的绿化植物种植间距(L)分别为1.74、2.32、3.48、4.64、5.80 m。在道路曲线段,车速分别为40、60、80、100 km/h时,使驾驶员保持对道路曲线曲率最佳感知效果的植物种植间距(L')分别为2.49、3.56、4.25、0.44 m。【结论】在城市道路直线段,以L间距种植绿化植物能达到最佳视线诱导效果; 在城市道路曲线段以相同设计速度下L与L'的最小值间距种植绿化植物,能达到最佳视线诱导效果,同时保持较高的曲线曲率感知精度。

The reasonable planting distance of urban road greening induced by driving sight line

【Objective】The purpose of this study is to standardize safety functions of city road landscaping, and to verify the reliability of vegetation effect on the traffic sight induction. 【Method】Based on the driver's visual characteristic analysis, two mathematical models were constructed based on a two-way, four-lane road as the basic linear model according to CJJ 37-2012(Urban Road Engineering Design Code). Model 1 is a straight section model which can form a continuous landscape at different design speeds. Model 2 is a curved section model with the best perception of the curvature at different design speeds. 【Results】On the straight road section, when the vehicle speed is 30, 40, 60, 80 and 100 km/h, the planting distance L is 1.74, 2.32, 3.48, 4.64, and 5.80 m, respectively, for the driver to view a continuous landscape. On the curved road section, when the vehicle speed is 40, 60, 80 and 100 km/h, the L' of the plant, i.e., the best perceived effect on the curvature of the road, is 2.49, 3.56, 4.25 and 0.44 m, respectively. 【Conclusion】On the straight section of city roads, the best effect can be achieved by planting plants at spacing L. On the curved section of the urban road, plants can be planted at the minimum spacing between L and L' at the same design speed to achieve the best effect while maintaining higher perception accuracy of curves.