| 螺旋匝道和螺旋桥的小客车行驶速度特征 |
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| 引用本文： | 徐进,崔强,林伟,王郸祁,吴国雄.螺旋匝道和螺旋桥的小客车行驶速度特征[J].中国公路学报,2019,32(7):158-171. |
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| 作者姓名： | 徐进 崔强 林伟 王郸祁 吴国雄 |
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| 作者单位： | 1. 重庆交通大学 山区复杂道路环境"人-车-路"协同与安全重庆市重点实验室, 重庆 400074;2. 林同棪国际工程咨询(中国)有限公司, 重庆 401147;3. 重庆交通大学 土木工程学院, 重庆 400074 |
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| 基金项目： | 国家自然科学基金项目（51678099）；交通运输部应用基础研究（主干学科）项目（2015319814050） |
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| 摘 要： | 为明确螺旋匝道和螺旋桥处的驾驶行为模式和汽车运行特征，在涪陵长江一桥、乌江二桥、重庆融侨大道和涪陵金凯环形高架4处地点开展螺旋匝道实车试验，用车载仪器采集自然驾驶状态下的汽车连续行驶轨迹、速度以及周围行驶环境等信息。基于自然驾驶数据，研究螺旋匝道范围内的速度变化模式、幅值特性以及影响因素。研究结果表明：单车道螺旋匝道的速度变化模式多样化，双车道螺旋匝道的行驶速度在整体上维持稳定，匝道范围内的连续升坡和降坡并未导致速度出现趋势性衰减和趋势性升高；螺旋匝道并入主线时，驾驶人在合流鼻之前有明显的、共性的减速行为，这与现行设计标准中的设计假定相反；除涪陵长江一桥之外，其余3处都是下行速度低于上行速度；螺旋匝道设计速度越低，实测速度与设计速度之间的偏离越严重，并且速度幅值离散化，因此不建议使用20 km·h-1的匝道设计速度；螺旋匝道运行速度与匝道半径成正相关。
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| 关 键 词： | 道路工程 行驶特性 实车试验 螺旋匝道 螺旋桥 自然驾驶 运行速度 驾驶行为 |
| 收稿时间： | 2018-07-01 |
Speed Behavior of Passenger Cars on Helical Ramps and Helical Bridges |
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| XU Jin,CUI Qiang,LIN Wei,WANG Dan-qi,WU Guo-xiong.Speed Behavior of Passenger Cars on Helical Ramps and Helical Bridges[J].China Journal of Highway and Transport,2019,32(7):158-171. |
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| Authors: | XU Jin CUI Qiang LIN Wei WANG Dan-qi WU Guo-xiong |
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| Affiliation: | 1. Chongqing Key Laboratory of"Human-Vehicle-Road"Cooperation & Safety for Mountain Complex Environment, Chongqing Jiaotong University, Chongqing 400074, China;2. T. Y. Lin International Engineering Consulting(China) Co., Ltd., Chongqing 401147, China;3. School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China |
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| Abstract: | As the driving patterns and dynamic characteristics of running vehicles on helical ramps and helical bridges remain unclear, field driving tests using real passenger cars were conducted on the Fuling Yangtze bridge, the second Wujiang bridge, Chongqing Rongqiao road, and the JinKai Bridge Loop. The track and speed of the naturally driven cars, as well as the environment around the cars, were collected by onboard instruments. Based on this naturalistic driving data, the trends, amplitude, and influencing factors upon speed were analyzed. The main findings of this research include the following. Helical ramps with a single lane exhibit various patterns with change in speed, while the speed on helical ramps with two lanes remains at a fixed value on the whole, although it fluctuates locally. Continuous ascent/descent in an upward ramp does not result in a decrease/increase in speed; Drivers usually decelerate their cars before the physical gore, where the helical ramp merges into the main line, which is the opposite of the design assumptions recommended by current interchange design guidelines; The negotiation speed on the upward ramps of the Yangtze Bridge is lower than that on the downward ramps, whereas the inverse result is found at the other three sites; A lower ramp design speed could lead to a larger deviation between it and the actual speed, and more dispersed sample speed data; thus, 20 km·h-1 is not recommended as the ramp design speed; The operating speed on helical ramps is positively correlated with the radius of the ramp. |
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| Keywords: | road engineering driving performance driving teat using real passenger cars helical ramp helical bridges naturalistic driving operating speed driver behavior |
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