排序方式: 共有161条查询结果,搜索用时 15 毫秒
71.
分析了目前我国公路建设项目可行性研究工作中存在的主要问题,提出进一步提高公路建设项目可行性研究工作水平与质量的措施及建议. 相似文献
72.
73.
The Connected Vehicle (CV) technology is a mobile platform that enables a new dimension of data exchange among vehicles and between vehicles and infrastructure. This data source could improve the estimation of Measures of Effectiveness (MOEs) for traffic operations in real-time, allowing to perfectly monitor traffic states after being fully adopted. However, as with any novel technology, the CV adoption will be a gradual process. This research focuses on determining minimum CV technology penetration rates that would guarantee accurate MOE estimates on signalized arterials. First, we present estimation methods for various MOEs such as average speed, number of stops, acceleration noise, and delay, followed by an initial assessment of the penetration rates required to accurately estimate them in undersaturated and oversaturated conditions. Next, we propose a methodology to determine the minimum CV market penetration rates to guarantee accurate MOE estimates as a function of traffic conditions, signal settings, sampling duration, and the MOE variability. A correction factor is also provided to account for small vehicle populations where sampling is done without replacement. The methodology is tested in a simulated segment of the San Pablo Avenue arterial in Berkeley, CA. The outcomes show that the minimum penetration rate required can be estimated within 1% for most MOEs under a wide range of traffic conditions. The proposed methodology can be used to determine if MOE estimates obtained with a portion of CV equipped vehicles can yield accurate enough results. The methodology could also be used to develop and assess control strategies towards improved arterial traffic operations. 相似文献
74.
75.
民众参与农村公路建设的必然性与技术水平提高的迫切性 总被引:1,自引:0,他引:1
针对当前农村公路建设的新形势和新机遇,通过对农村公路建设特点,影响农村公路建设的几大因素及面临的困难和问题的分析,探索建立农村公路建设与管理机构的方法和措施。 相似文献
76.
文章结合河池至都安高速公路工程实例,介绍了该项目典型示范工程在"人本化、专业化、标准化、信息化、精细化"的原则要求下,实施过程控制的相关措施,为山区高速公路典型示范工程建设提供参考。 相似文献
77.
文章对公路建设及营运的环境问题进行分析,提出了提高环境意识与健全制度、强化环境监督管理、制定工程与技术措施等对策建议,为相关部门防治公路环境问题提供参考。 相似文献
78.
本文介绍了川江及三峡库区航运现状,分析了目前存在的主要问题,提出川江及三峡库区船型标准化的指导思想、总体目标、相关措施和政策建议。 相似文献
79.
80.