浅谈交通标志施工质量的控制

交通标志的质量控制可以从产品质量和施工质量两大方面来控制,从交通标志基础定位放样、基坑开挖、基础混凝土浇注、标志立柱安装、标志板安装几个方面阐述了交通标志施工过程中的质量控制,具有重要的实践指导意义.     

交通职业学校的SWOT分析与发展策略

目前,我国交通职业学校面临着和其他职业学校一样的生存压力,同时交通行业“技工难求”现象又普遍存在,如何解决这两者之间的矛盾成为当前亟待解决的问题。本文运用管理学中的SWOT分析法分析交通职业学校发展过程中在内部环境中具有的优势和劣势以及外部环境中存在的机会和威胁,并据此提出了发展交通职业学校的基本原则和策略。     

Multi-objective signal control of urban junctions – Framework and a London case study

This paper presents an approach to multi-objective signal control using fuzzy logic. The signal control uses fuzzy logic where the membership functions are optimised according to the Bellman–Zadeh principle of fuzzy decision-making. This approach is both practical for the decision-maker and efficient, as it leads directly to a Pareto-optimal solution. Signal control priorities are ultimately a political decision. Therefore the tool developed in this research allows the traffic engineer to balance the objectives easily by setting acceptability and unacceptability thresholds for each objective. Particular attention is given in the example to pedestrian delays. The membership functions of the fuzzy logic are optimised by a genetic algorithm coupled to the VISSIM microscopic traffic simulator. The concept is illustrated with a case study of the Marylebone Road–Baker Street intersection in London at which pedestrians as well as vehicle flows are high. The results prove the feasibility of the framework and show the vehicle delays for a more pedestrian friendly signal control strategy.     

地铁站点施工期交通组织工作思路与方法

由于地铁站点施工对城市交通会产生极大的影响,因此提前做好施工期间系统的交通组织工作,对保障城市正常生产、生活和地铁站点的顺利施工有着重要意义。文章结合成都地铁二号线站点施工期间交通组织工作经验,针对地铁施工的特点,就施工期间的交通组织工作思路、方法等进行探讨。     

城市主要道路平面交叉口安全管理方法

文章基于现今城市干道平面交叉口交通流量密集的状况,分析讨论影响平面交叉口安全管理的因素,提出了交叉口安全管理方法和一些改进措施,为提高城市道路交叉口的交通安全管理提供依据。     

如何建立多商业中心模式解决城市交通问题

文章对城市交通拥堵及其解决措施进行了探讨,为优化单商业中心城市交通资源使用,缓解城市交通拥堵,提出建立多个次级商业中心的设想和实现方式。并建立简单模型对单商业中心模式与多商业中心模式进行比较分析,证明从解决交通问题的角度考虑,城市采取多商业中心模式优于单商业中心模式。     

Performance Evaluation of Handoff-Based Cellular Traffic Monitoring Systems Using Combined Wireless and Traffic Simulation Platform

Handoff-based cellular probe technologies have been proven to be a cost-effective solution for traffic surveillance due to their low cost, large sample size, and intensive spatial coverage. At the same time, the development of reliable simulation tools that can be used to conduct a feasibility study, performance evaluation, and estimation model testing for cellular probe technologies, especially in the arterial environment, is still limited. In this study, by simulating the real-world signal delaying and wireless signal communication protocols, we establish a simulation platform for evaluating cellular probe system. The simulation platform eliminates unrealistic assumption on static and regular cell boundaries in the existing simulation tools and can provide simulation results similar to field observations. Based on the platform, we compared the performance of cellular probe system under both freeway and arterial environment. We analyzed the impact of traffic conditions, the duration of cellphone calls, and penetration rate on the handoff efficiency, handoff link speed error, and information-disseminating link speed estimation error. In addition, we also provide a detailed evaluation of the accuracy of the intersection delay estimation and the potential error sources and mechanism. The results show that the handoff-based cellular probe technologies attain good performance in traffic monitoring and the proposed simulation platform can reflect the real-world condition on an acceptable level.     

Estimating Missing Traffic Volume Using Low Multilinear Rank Tensor Completion

Traffic volume data have been collected and used for various purposes in some aspects of intelligent transportation systems (ITS) applications. However, the unavoidable detector malfunction can cause data to be missing. It is often necessary to develop an effective approach to recover the missing data. In most previous methods, temporal correlation is explored to reconstruct missing traffic volume. In this article, a new missing traffic volume estimation approach based on tensor completion is proposed by exploring traffic spatial–temporal information. The tensor model is utilized to represent traffic volume, which allows for exploring the multicorrelation of traffic volume in spatial and temporal information simultaneously. In order to estimate the missing traffic volume represented by the tensor model, a novel tensor completion algorithm, called low multilinear rank tensor completion, is proposed to reconstruct the missing entries. The proposed approach is evaluated on the PeMS database. Experimental results demonstrate that the proposed method is more effective than the state-of-art methods, especially when the ratio of missing data is high.     

典型高速公路风吹雪综合安全防护方案研究

文章在总结风吹雪一般防治方法及措施的基础上,结合内蒙古绥满国道主干线博克图至牙克石段高速公路工程,从路基、交通工程设施、监控系统、防雪设施、管理体制等方面,系统地提出高速公路风吹雪综合安全防护方案,供相关工程技术人员参考。     

汽车撞行人和骑自行车人事故特征参数对比研究

汽车碰撞行人事故与汽车碰撞骑自行车人事故的某些特点相类似,具有一定的可比性．基于综合人-车-路-环境的交通事故信息模型,对事故再现研究室近年来承担的北京市行人事故和自行车事故鉴定案例资料进行统计分析,根据研究目的和统计样本的实际情况,选取典型的特征参数,将两类事故进行综合对比研究,得出了行人事故和自行车事故的一些相似的发生规律和各自不同的特点,并对统计结果在事故再现及交通安研究方面的应用进行了初步探讨。