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一级公路高速化前后的交通适应性分析

, PP. 98-104

Keywords: 交通工程,交通适应性,对比分析,一级公路高速化,运行速度,三轴加速度,事故率

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Abstract:

?针对设计速度80km·h-1的四车道一级公路改建为同等速度四车道高速公路后的交通适应性问题,通过现场测速对比分析了高速化前后典型路段上的运行速度,并应用运行速度分析了线形的连续性和设计一致性;基于实测三轴加速度,分析了平、竖曲线高速化后行车的力学性能;应用最新版IHSDM软件预测了交通事故,并对比分析了高速化前后的交通安全状况。研究结果表明:高速化后小型车的运行速度明显提高,尤其在非几何受限路段及下坡路段,且对线形变化更加敏感,对线形设计均衡性提出更高要求;高速化后在小半径平曲线上小型车有明显的超高不足倾向,在小半径竖曲线上竖向加速度增大且有舒适性变差趋势;高速化后事故率普遍下降,降幅达高速化前的12.4%~20.32%。

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