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随着广西高等级公路建设规模的进一步扩大,公路设计要求日益提高,高等级公路设计中曲线超高设计显得尤为重要。文章根据我国现行的路线设计规范,结合日本的路线设计经验,介绍曲线超高在广西公路设计中的应用。 相似文献
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本文为了确定高速公路隧道内提速方案具体的限速值,通过选取多条有提速需求的典型高速公路隧道进行试验,通过瞳孔面积变化率表征驾驶人在隧道内的视觉负荷程度。根据瞳孔面积变化率与机动车临界速度之间的关系,得到满足明、暗适应的视觉负荷程度对应的机动车临界速度值,取机动车临界速度分析车辆进出高速公路隧道时由于明、暗适应引起的速度变化规律;提出了以机动车临界速度值和全线提速方案对应的隧道限速值,取两者最小值作为隧道最终提速方案的限速值,然后对隧道限速原则进行修正,最后确定了原隧道路段限速60km/h、80km/h时的提速方案的具体限速值。研究结果表明:对于满足提速要求的隧道路段,原限速60km/h时,提速后的限速值取80km/h较合适;原隧道路段限速80km/h时,提速后的限速值取90km/h较合适。本文的研究具有安全性、可靠性,为日后隧道限速提供了相应参考。 相似文献
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公路车速限制与行车安全视距关系的探讨 总被引:1,自引:0,他引:1
通过对新建公路限制车速与行车安全视距值之间的关系探讨,对新建公路限制车速采用的行车安全视距值与影响因素进行量化,提供了新建公路限速选用的行车安全视距范围,可供道路工程设计及高等级公路管理人员参考. 相似文献
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针对山区高等级公路的特点,分析山区高等级公路建设的意义和难度,提出了平、纵、横设计新理念,总结了山区高等级公路的设计思路。 相似文献
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文章分析了广西高速公路速度限制存在的主要问题,提出了改进高速公路速度限制的相关措施,对提高广西高速公路管理水平和高速公路通过率、保证行车安全及减少公路交通事故具有现实的意义。 相似文献
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文章从路基、路面、路肩、桥涵防水处治等方面,介绍了广西宜州-柳州高速公路为达成"十年不换板"目标而进行的水泥混凝土路面预防性养护实践,阐述了预防性养护所取得的显著效益,并对"十年不换板"的经验做法进行总结分析,为高速公路水泥混凝土路面养护提借参考。 相似文献
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广西面临着西部大开发、CEPA、GMS、中国-东盟自由贸易区、泛珠三角经济圈、环北部湾经济圈等历史性机遇。如何抓住这一历史性机遇,乘势而上,构建广西面向东盟的国际道路运输业,是摆在我们面前的当务之急。作者从广西国际道路运输业的实际出发,分析了广西具有发展国际道路运输的独特优势和良好机遇,着重阐述了广西新一轮国际道路运输发展的战略布局,提出了加快广西国际道路运输发展的目标、方向和对策。 相似文献
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文章基于广西道路运输行业信息化建设情况,分析了制约信息化建设的主要因素,指出了广西道路运输信息化建设的思路和目标,并探讨了实现创新高效、资源共享、机制完善、服务优质的信息化可持续发展道路应采取的措施。 相似文献
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文章介绍建议速度的定义,阐述了建议速度标志的设置范围,并从提高设计速度、降低公路建造成本、提高公路通过率、避免速度陷阱与公路乱罚款、提高公路管理水平、减少交通事故、节能环保等方面探讨了建议速度的应用价值及意义。 相似文献
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C. Asensio J.M. López R. Pagán I. Pavón M. Ausejo 《Transportation Research Part D: Transport and Environment》2009,14(5):360-366
One of the most difficult and expensive tasks in making noise pollution maps is the collection and processing of the data needed to create acoustic models. In the case of road traffic noise maps, obtaining speed data for light and heavy vehicles a problem that has usually been avoided by using a road’s speed limit or by making assumptions based on experience from similar road types. Here global positioning systems-based techniques are applied for acquiring vehicle speed data and adapted to fulfill the requirements of noise prediction models. 相似文献
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文章介绍了当前广西道路货物运输行业的基本情况,阐述了广西道路货物运输安全生产存在的主要问题,并从行政管理和企业管理的角度,提出了切合广西道路货物运输行业实际的安全管理措施。 相似文献
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Variable speed limit systems where variable message signs are used to show speed limits adjusted to the prevailing road or traffic conditions are installed on motorways in many countries. The objectives of variable speed limit system installations are often to decrease the number of accidents and to increase traffic efficiency. Currently, there is an interest in exploring the potential of cooperative intelligent transport systems including communication between vehicles and/or vehicles and the infrastructure. In this paper, we study the potential benefits of introducing infrastructure to vehicle communication, autonomous vehicle control and individualized speed limits in variable speed limit systems. We do this by proposing a cooperative variable speed limit system as an extension of an existing variable speed limit system. In the proposed system, communication between the infrastructure and the vehicles is used to transmit variable speed limits to upstream vehicles before the variable message signs become visible to the drivers. The system is evaluated by the means of microscopic traffic simulation. Traffic efficiency and environmental effects are considered in the analysis. The results of the study show benefits of the infrastructure to vehicle communication, autonomous vehicle control and individualized speed limits for variable speed limit systems in the form of lower acceleration rates and thereby harmonized traffic flow and reduced exhaust emissions. 相似文献
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This paper investigates the local and global impact of speed limits by considering road users’ non-obedient behavior in speed selection. Given a link-specific speed limit scheme, road users will take into account the subjective travel time cost, the perceived crash risk and the perceived ticket risk as determinant factors for their actual speed choice on each link. Homogeneous travelers’ perceived crash risk is positively related to their driving speed. When travelers are heterogeneous, the perceived crash risk is class-specific: different user classes interact with each other and choose their own optimal speed, resulting in a Nash equilibrium speed pattern. With the speed choices on particular roads, travelers make route choices, resulting in user equilibrium in a general network. An algorithm is proposed to solve the user equilibrium problem with heterogeneous users under link-specific speed limits. The models and algorithms are illustrated with numerical examples. 相似文献
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This research presents an integrated optimal controller to maximize the fuel efficiency of a Hybrid Electric Vehicle (HEV) traveling on rolling terrain. The controller optimizes both the vehicle acceleration and the hybrid powertrain operation. It takes advantage of the emerging Connected Vehicle (CV) technology and utilizes present and future information as optimization input, which includes road topography, and dynamic speed limit. The optimal control problem was solved using Pontryagin’s Minimum Principle (PMP). Efforts were made to reduce the computational burden of the optimization process. The evaluation shows that the benefit of the proposed optimal controller is significant compared to regular HEV cruising at the speed limit on rolling terrain. The benefit ranges from 5.0% to 8.9% on mild slopes and from 15.7% to 16.9% on steep slopes. The variation is caused by the change of hilly road density. 相似文献