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随着路网的完善,国省道公路大中修是未来公路养护部门的主要工作。通过某省道大中修工程,根据左右幅病害及交通轴载完全不同的现状,提出国省道路面大中修分车道设计理念。 相似文献
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This first part of the state-of-the art focuses on the origins of road safety modeling, covering data, early models and the public health context of model formulation and use. 相似文献
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This paper reviews road safety performance in the United States. The paper develops a framework for assessing dimensions of road safety, and analyzes the importance of economic factors, travel patterns, demographics, road/traffic/vehicle technology, driver behavior, and public policy. Issues and challenges for future road safety research are discussed. 相似文献
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针对不利气象条件给公路交通畅通、运行安全、管养成本带来的不利影响,提出了不利天气条件下高速公路安全管理系统的构建思路、主要功能以及子系统构成。能够满足不利气象条件下的高速公路交通安全管理需求的系统由六大子系统构成:道路气象环境监测系统、道路天气预报及影响评估系统、多信息融合的先进交通管理系统、智能信息发布系统、冬季道路养护决策支持系统及紧急救援系统。 相似文献
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在密度分层的海洋中,活动频繁的内波对船舶与海洋工程结构物安全性和正常运行造成直接的破坏性影响,研究内波与结构物作用具有重要的学术意义和工程实际应用价值。本文通过对结构物进行分类,介绍了国际上分层流中内波与海洋结构物相互作用的研究动态,并对其发展趋势做了相关探讨。 相似文献
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S. Velmurugan S. Padma E. Madhu S. Anuradha S. Gangopadhyay 《Research in Transportation Economics》2013
In this study, an attempt has been made to develop Multinomial Logit (MNL) model by analysing the drunken and non drunken drivers involved in road crashes on Indian highways. Multinomial Logit model has been deployed to assess the influence of various parameters like vehicular, environment and geometric factors on the set of drivers who were found to be drunk at the time of getting involved in the road crash and those who were not under the influence of alcohol at the time of meeting with the road crash. The total economic cost of road crashes in the case of non-drunk driver road crash is Rs. 1046.27 million whereas in the case of drunk driver road crashes it is estimated to be Rs. 204.50 million. Further, it can be observed that economic cost of drunk driver road crashes is varying from 13 to 19 % across different types of road crashes. 相似文献
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一个国家在金融和外汇汇率方面的动荡,将会给国家宏观和微观经济、国家的发展、人民的生活乃至国家的政治安全带来很大的影响。文中从国际收支及国内经济形势分析两方面预测了人民币汇率未来的走势情况。 相似文献
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The second part of the state-of-the-art focuses on the development of the founders' double streams explaining single-outcome indicators (probability of accidents and fatalities, respectively) by fixed form regression, as outlined in the Part 1. Following Page (1997, pp. 67–122, 2001) and others, we use as turning point of the evolution of both aggregate and discrete approaches the DRAG-1 model of 1984, itself based on aggregate data, which introduced four key innovations in principle applicable to both streams. 相似文献
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合理规划港区闸口通道数量和道路宽度是保证整个港区集疏运顺畅的关键因素。首先对码头闸口系统的作业特点和道路通行能力进行研究,定性分析并给出了闸口通道数量和道路通行能力相关参数的理论计算公式。然后利用计算机仿真技术,结合离散事件动态理论、排队论及交通流理论,建立了港区码头闸口通道数量及道路宽度仿真复合模型,并针对实际案例进行仿真试验研究。研究方法对提高港区规划设计水平有一定的参考意义。 相似文献
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水泥混凝土路面的修复整治已经成为广大市政建设工作者关注和研究的—个重要课题。在水泥混凝土路面上做沥青加铺层,具有“刚柔相济”的特点,路基强度高,稳定性好,路面平整、无接缝,行车舒适,能够大大改善旧路面的使用性能。 相似文献
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This paper reviews theoretical issues surrounding transport safety modeling and the implications for road safety policy. The behavioral mechanisms that affect transport safety are typically not considered in safety modeling. These issues are discussed in the context of trade-offs between risk-taking, as perceived by travelers, and other mobility objectives and the attributes associated with them. This is an extension of other theoretical frameworks, such as risk compensation, and attempts to integrate some of the previous frameworks developed over the years. Various examples of behavioral adaptation to specific policies are discussed and linked to the framework. These issues are then discussed in the context of improvements to empirical work in this area and the linkage of theoretical frameworks to crash modeling, in particular the estimation and use of Crash Modification Factors. Conclusions suggest that there are many deficiencies in practice, from estimation of models to choice of effective policies. Progress is being made on the former, while the publication of practical guidance seems to have substantial lags in knowledge. 相似文献
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移动对象数据库对大量移动对象的位置信息进行管理,能够支持传统数据库不能进行的时空查询,考虑到大多数移动对象的运动都固定在已知的路线当中,基于公路网的移动对象数据模型通过对公路网拓扑图的数字化转换,能够对移动对象进行有效的管理,采用实时平均法反映每条线路的动态运行情况,对移动对象未来位置进行精确预测。 相似文献
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在Logit动态的基础上建立了收费和通行能力的联合控制模型,通过控制时变的道路收费水平和通行能力,优化交通流的演化轨迹,使交通系统达到最优。通过简单的算例,在Logit动态的基础上对道路中的交通流进行分析和预测,进而对车辆进行诱导,从而达到交通管理的目的。 相似文献