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【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。
【Objective】 To standardize the traffic safety function of urban road greening and improve the reliability of greening plants on driving sight. 【Method】 According to the analysis of driver’s visual characteristics, two mathematical models were constructed with two-way four-lane as the basic linear model according to “Code for Urban Road Engineering Design” (CJJ 37-2012); one was to form continuous landscape at different design speeds And the other is a curve segment model that forms the best curve curvature perception effect at different design speeds. 【Result】 The planting distance (L) of green plants which make the driver form a continuous landscape feeling in the straight line of the road with the vehicle speeds of 30, 40, 60, 80 and 100 km / h respectively is 1.74, 2.32, 5.80 m. In the curve section of the road, the planting distance (L ’) of the plant that allows the driver to maintain the best perception of the curvature of the road when the vehicle speed is 40, 60, 80 and 100 km / h respectively is 2.49, 3.56, 4.25 and 0.44 m . 【Conclusion】 The best line of sight induction effect can be achieved by planting greenery plants with L spacing in the straight section of the urban road. In the curve section of city road, planting green plants with the minimum spacing between L and L ’at the same design speed can achieve the best line of sight Induces effects while maintaining high curvilinear sensing accuracy.