排序方式: 共有180条查询结果,搜索用时 31 毫秒
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结合《辽阳灯塔至沈阳辽中高速公路水土保持方案》编制中对路线方案进行的水土保持定量分析评价,提出了公路项目水土保持评价因素,验证了公路项目路线方案比选水土保持定量评价方法的可行性。 相似文献
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高速公路在山岭重丘区的路线设计受到地形、地势、地质、水文等诸多自然条件的制约和限制。结合工程实例,对山岭重丘区高速公路选线进行分析和研究,寻找出运行安全、生态环保、易于实施、并且具有项目可持续发展的路线设计方案。 相似文献
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Alan J. Horowitz 《运输规划与技术》2013,36(3):175-182
Maximum time lengths of urban trips can be used to calculate major user benefits of transportation improvements. These benefits include those associated with reduced cost of travel, those associated with travel to additional destinations, and those associated with improved quality of destinations. Maximum trip lengths can be measured using techniques of psychological scaling. 相似文献
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This paper proposes an integrated Bayesian statistical inference framework to characterize passenger flow assignment model in a complex metro network. In doing so, we combine network cost attribute estimation and passenger route choice modeling using Bayesian inference. We build the posterior density by taking the likelihood of observing passenger travel times provided by smart card data and our prior knowledge about the studied metro network. Given the high-dimensional nature of parameters in this framework, we apply the variable-at-a-time Metropolis sampling algorithm to estimate the mean and Bayesian confidence interval for each parameter in turn. As a numerical example, this integrated approach is applied on the metro network in Singapore. Our result shows that link travel time exhibits a considerable coefficient of variation about 0.17, suggesting that travel time reliability is of high importance to metro operation. The estimation of route choice parameters conforms with previous survey-based studies, showing that the disutility of transfer time is about twice of that of in-vehicle travel time in Singapore metro system. 相似文献
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文章结合广西桂海高速公路改扩建工程实例,基于高速公路改扩建路线设计的思路及原则,介绍了桂海高速公路改扩建工程设计方案与路线平纵横断面设计方法,为国内类似工程设计提供参考。 相似文献
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实施人才强国战略,是抓住和用好重要战略初遇期、应对日益激烈的国际竞争的必然要求,是全面建设小康社会、开创中国特色社会主义事业新局面的必然要求,是增强党的执政能力、巩固党的执政地位的必然要求。 相似文献
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Electric travelling appears to dominate the transport sector in the near future due to the needed transition from internal combustion vehicles (ICV) towards Electric Vehicles (EV) to tackle urban pollution. Given this trend, investigation of the EV drivers’ travel behaviour is of great importance to stakeholders including planners and policymakers, for example in order to locate charging stations. This research explores the Battery Electric Vehicle (BEV) drivers route choice and charging preferences through a Stated Preference (SP) survey. Collecting data from 505 EV drivers in the Netherlands, we report the results of estimating a Mixed Logit (ML) model for those choices. Respondents were requested to choose a route among six alternatives: freeways, arterial ways, and local streets with and without fast charging. Our findings suggest that the classic route attributes (travel time and travel cost), vehicle-related variables (state-of-charge at the origin and destination) and charging characteristics (availability of a slow charging point at the destination, fast charging duration, waiting time in the queue of a fast-charging station) can influence the BEV drivers route choice and charging behaviour significantly. When the state-of-charge (SOC) at the origin is high and a slow charger at the destination is available, routes without fast charging are likely to be preferred. Moreover, local streets (associated with slow speeds and less energy consumption) could be preferred if the SOC at the destination is expected to be low while arterial ways might be selected when a driver must recharge his/her car during the trip via fast charging. 相似文献