共查询到20条相似文献,搜索用时 437 毫秒
1.
2.
3.
4.
5.
本文对无信号控制的干线公路平面交叉合理间距设置进行了研究,通过对干线公路平面交叉之间交通流的运行特性及几何参数进行分析,对干线公路交叉口之间的距离进行分段,结合影响干线公路平交间距设置的因素—交通特性和平交口密度,采用理论几何分析的方法,分段确定干线公路平面交叉间各区段最小长度的推荐值。通过搜集已有实际工程平交口间距设置数据进行验证,验证结果表明推荐间距有助于车辆的安全运行。 相似文献
6.
7.
8.
通过对福建省福鼎宁德段高速公路声环境现状的调查研究,采用类比分析的方法,确定其沿线所要保护的声环境敏感点,合理科学预测交通噪声对声环境的影响,提出减轻噪声污染的若干措施。 相似文献
9.
10.
11.
12.
13.
14.
15.
17.
The rationale for congestion charges is that by internalising the marginal external congestion cost, they restore efficiency in the transport market. In the canonical model underlying this view, congestion is a static phenomenon, users are taken to be homogenous, there is no travel time risk, and a highly stylised model of congestion is used. The simple analysis also ignores that real pricing schemes are only rough approximations to ideal systems and that inefficiencies in related markets potentially affect the case for congestion charges. The canonical model tends to understate the marginal external congestion cost because it ignores user heterogeneity and trip timing inefficiencies. With respect to the relevance of interactions between congestion and congestion charges and tax distortions and distributional concerns, recent insights point out that there is no general case for modifying charges for such interactions. Therefore the simple Pigouvian rule remains a good first approximation for the design of road charging systems. 相似文献
18.
19.
K. W. Ogden 《运输评论》2013,33(2):101-123
This paper addresses the question of road cost recovery in the Australian context. It reviews some of the major issues and emphasizes the inherent problems (both theoretical and practical) in resolving these issues. The result of these complexities is that the answers to many of the key questions are ‘assumption‐sensitive’. Some of the more significant studies which have been conducted in Australia in recent years are briefly reviewed, and the numerical results of one recent study—the National Road Freight Industry Inquiry (1984) are presented. 相似文献
20.
《Transportation Research Part A: Policy and Practice》2005,39(7-9):705-722
Recently there has been a resurgence in the interest of road pricing. Most studies adopt the static modeling paradigm, typically using either separable monotone or backward-bending link travel time functions for the analysis. In this study, through the shockwave analysis, we show that separable backward-bending functions are not appropriate for modeling hyper-congestion and hence road pricing. In the absence of queue spillback, link travel time is a monotone increasing function of inflow. However, in the presence of queue spillback, we show that the static paradigm even with a monotone travel time function cannot adequately portray the congestion phenomenon. In some cases, the tolls determined by the static paradigm can be even detrimental, worsening rather than alleviating the congestion problem. In the end, to model congested networks properly, perhaps one has no other choices but to adopt a modeling paradigm that faithfully captures both the temporal as well as the spatial dimensions of traffic queuing. 相似文献