黄浦江首座公轨双层桥——闵浦二桥引桥工程总体方案研究

上海市轨道交通5号线南延伸工程跨越黄浦江节点与沪闵路一沪杭公路地方交通越江工程结合（即闵浦二桥新建工程），采用上下双层一体化结构形式。结合一体化区间引桥段桥梁型式，对各种方案的结构合理性、交通功能、对景观与环境的影响、工程量以及车站布置等方面进行了研究和论证，最终推荐“干”字形的独柱桥墩为实施方案。     

长大公路隧道交通工程的功能与分类的探讨

针对目前公路隧道有关土建工程与交通工程的设计与施工内容的划分还不规范,文章对独立长大公路隧道交通工程各系统的分类与功能、系统及其附属设施的布置原则进行了全面探讨,简述了有关公路隧道交通工程急待解决的课题.     

区域综合运输枢纽规划的重点

国际经济全球化和国内经济一体化进程的迅速发展,对我国交通一体化发展提出了越来越高的要求,区域经济一体化促进区域交通一体化的发展。近年来,我国对区域综合交通运输的规划非常重视,进行了长江三角洲地区现代化公路水路交通规划、泛珠三角公路水路交通规划、西部地区综合交通运输网络体系建设思路与对策研究、京津冀都市圈区域规划综合交通网和东北地区区域交通发展规划等方面的区域综合运输规划。而综合运输枢纽是综合交通运输网络建立的基础条件和重要组成部分,也是形成和完善一体化运输系统的关键。因此,区域综合运输枢纽的规划对区域…     

城市绿色交通一体化走廊管理研究

一体化走廊是城市绿色交通未来发展的关键.高质量的绿色交通一体化走廊既能满足市民对高效、便捷出行的需求、又能有效减少雾霾、噪声、尾气等环境污染,达到城市节能环保、可持续发展的目的.本文着眼于绿色公交站点,对大城市绿色交通一体化走廊管理方法进行研究,为我国未来绿色交通一体化发展提供理论与实践依据.     

城乡道路运输一体化的基本途径

在当前和今后的一段时期内,城乡交通发展的主要矛盾仍然是有限的交通供给与不断增长的交通需求之间的矛盾。为了缓解两者之间的矛盾,一方面要加强交通供给的能力,另一方面则要合理引导交通需求,城乡交通一体化从这两个方面出发,较好地满足了城乡交通发展的要求。因此,对城乡交通(主要表现为道路运输)一体化进行深入研究,处理好城乡交通发展中数量与质量、管理与效率之间的关系,对实现城乡交通跨越式发展大有裨益。一、城乡道路运输一体化的内涵及意义1、城乡道路运输一体化的内涵城乡道路运输一体化是逐渐优化城乡交通系统,方便居民出行和货…     

广佛同城化区域交通一体化规划实践

文章分析了广州、佛山两市同城化区域交通存在的问题,探讨了交通一体化战略目标及发展策略;同时通过结合城市群交通规划特点及实践,提出了城市群交通一体化规划的一般方法,对今后城市群交通一体化规划开展更深入的研究提出了相关建议。     

上海市共和新路高架工程一体化高架桥墩施工设计

介绍了共和新路高架工程一体化高架桥墩的设计原则与方法，结构分析计算，节点构造布置及斜立柱的施工技术措施，为今后一体化双层高架结构的设计提供参考。     

京津冀交通一体化与区域经济耦合:基于熵权法的协调分析

研究京津冀交通一体化与区域经济协调发展关系有助于提高对加快推进京津冀协同发展背景下交通一体化进程的认知。本文在分析交通运输与经济系统相互作用机制的基础上,建立了交通一体化与区域经济协调发展的评价指标;采用熵权法为各指标进行赋权,构建了交通一体化与区域经济协调发展的耦合分析模型;对京津冀区域2007—2016年交通运输与区域经济之间的耦合协调度进行计算。计算结果显示:两者耦合度虽然存在波动,但总体上是稳步提高,耦合协调等级从失调逐步向协调转变,特别是2014年国家提出京津冀一体化战略以来,两者耦合协调度明显提高,且协调度呈现增长趋势。这同时也可以反映了京津冀交通一体化对河北省经济发展有的促进和良性互动作用。     

信息化是人车路一体化最重要的桥梁与纽带

本文在对比国内外高速公路动态限速信息标志设置、城市道路交通诱导信息和交通诱导设施整合实际案例的基础上,从国内外交通动静态信息一体化、交通信息与驾驶行为一体化以及路面交通诱导信息与车载导航信息、手机导航信息一体化角度进行阐述,对我国与发达国家在ITS发展方面存在的差距展开思考,为进一步明确我国ITS的发展方向提供建议和借鉴。     

广佛交通一体化问题分析与对策研究

本文通过对广佛都市圈在珠三角城市圈的特殊地位分析,得出实现广佛交通一体化的必要性;针对广佛目前的交通现状问题,提出了广佛一体化的交通发展目标与任务,探讨了建构一体化交通的策略方案。     

Fine-tuning ADAS algorithm parameters for optimizing traffic safety and mobility in connected vehicle environment

Under the Connected Vehicle environment where vehicles and road-side infrastructure can communicate wirelessly, the Advanced Driver Assistance Systems (ADAS) can be adopted as an actuator for achieving traffic safety and mobility optimization at highway facilities. In this regard, the traffic management centers need to identify the optimal ADAS algorithm parameter set that leads to the optimization of the traffic safety and mobility performance, and broadcast the optimal parameter set wirelessly to individual ADAS-equipped vehicles. Once the ADAS-equipped drivers implement the optimal parameter set, they become active agents that work cooperatively to prevent traffic conflicts, and suppress the development of traffic oscillations into heavy traffic jams. Measuring systematic effectiveness of this traffic management requires am analytic capability to capture the quantified impact of the ADAS on individual drivers’ behaviors and the aggregated traffic safety and mobility improvement due to such an impact. To this end, this research proposes a synthetic methodology that incorporates the ADAS-affected driving behavior modeling and state-of-the-art microscopic traffic flow modeling into a virtually simulated environment. Building on such an environment, the optimal ADAS algorithm parameter set is identified through a multi-objective optimization approach that uses the Genetic Algorithm. The developed methodology is tested at a freeway facility under low, medium and high ADAS market penetration rate scenarios. The case study reveals that fine-tuning the ADAS algorithm parameter can significantly improve the throughput and reduce the traffic delay and conflicts at the study site in the medium and high penetration scenarios. In these scenarios, the ADAS algorithm parameter optimization is necessary. Otherwise the ADAS will intensify the behavior heterogeneity among drivers, resulting in little traffic safety improvement and negative mobility impact. In the high penetration rate scenario, the identified optimal ADAS algorithm parameter set can be used to support different control objectives (e.g., safety improvement has priority vs. mobility improvement has priority).     

道路交通事故分析及预防对策

道路交通事故的预防是一个系统工程,通过对全国和新疆道路交通安全现状与道路交通事故原因的对比分析,分别从影响道路交通安全的人、车、路及环境四个方面提出了降低和预防道路交通事故的发生,确保行车安全的相应措施和建议。     

Stability analysis on a dynamical model of route choice in a connected vehicle environment

Research on connected vehicle environment has been growing rapidly to investigate the effects of real-time exchange of kinetic information between vehicles and road condition information from the infrastructure through radio communication technologies. A fully connected vehicle environment can substantially reduce the latency in response caused by human perception-reaction time with the prospect of improving both safety and comfort. This study presents a dynamical model of route choice under a connected vehicle environment. We analyze the stability of headways by perturbing various factors in the microscopic traffic flow model and traffic flow dynamics in the car-following model and dynamical model of route choice. The advantage of this approach is that it complements the macroscopic traffic assignment model of route choice with microscopic elements that represent the important features of connected vehicles. The gaps between cars can be decreased and stabilized even in the presence of perturbations caused by incidents. The reduction in gaps will be helpful to optimize the traffic flow dynamics more easily with safe and stable conditions. The results show that the dynamics under the connected vehicle environment have equilibria. The approach presented in this study will be helpful to identify the important properties of a connected vehicle environment and to evaluate its benefits.     

道路环境对交通安全的影响及对策

交通安全,涉及到人、车以及道路和环境等很多因素。近年来,因为各种原因使得有关单位以及人员将更多的将精力放在人、车、道路这几个因素上,对道路交通环境没有过多的考虑和研究。深入研究道路交通环境,有利于道路交通的安全,文章通过对其的研究和分析,得出有关道路交通环境对交通安全的影响和解决措施,对于防止道路交通安全事故具有重要意义。同时为人们的生命财产的安全提供保障、对构建社会主义和谐社会具有很大帮助。     

站城融合理念下高铁客运枢纽区域步行交通布置研究

本文对高铁客运枢纽区域内步行交通的影响范围和功能定位进行分析,提出在站城融合理念下,步行交通是高铁客运枢纽最重要的交通方式。利用开源数据,对比我国京沪高铁沿线与日本东海道新干线,以及北京南站、上海虹桥站、东京站、名古屋站,分析枢纽步行交通的影响因素,并提出站城融合背景下枢纽步行交通系统的规划建设重点和指标体系,为高铁客运枢纽实现站城融合、建立完善的步行交通系统提供参考。     

Connectivity-based optimization of vehicle route and speed for improved fuel economy

Traditionally, vehicle route planning problem focuses on route optimization based on traffic data and surrounding environment. This paper proposes a novel extended vehicle route planning problem, called vehicle macroscopic motion planning (VMMP) problem, to optimize vehicle route and speed simultaneously using both traffic data and vehicle characteristics to improve fuel economy for a given expected trip time. The required traffic data and neighbouring vehicle dynamic parameters can be collected through the vehicle connectivity (e.g. vehicle-to-vehicle, vehicle-to-infrastructure, vehicle-to-cloud, etc.) developed rapidly in recent years. A genetic algorithm based co-optimization method, along with an adaptive real-time optimization strategy, is proposed to solve the proposed VMMP problem. It is able to provide the fuel economic route and reference speed for drivers or automated vehicles to improve the vehicle fuel economy. A co-simulation model, combining a traffic model based on SUMO (Simulation of Urban MObility) with a Simulink powertrain model, is developed to validate the proposed VMMP method. Four simulation studies, based on a real traffic network, are conducted for validating the proposed VMMP: (1) ideal traffic environment without traffic light and jam for studying the fuel economy improvement, (2) traffic environment with traffic light for validating the proposed traffic light penalty model, (3) traffic environment with traffic light and jam for validating the proposed adaptive real-time optimization strategy, and (4) investigating the effect of different powertrain platforms to fuel economy using two different vehicle platforms. Simulation results show that the proposed VMMP method is able to improve vehicle fuel economy significantly. For instance, comparing with the fastest route, the fuel economy using the proposed VMMP method is improved by up to 15%.     

交通事故预警系统构建

针对交通安全现状及国内外交通预警发展现状的分析,阐明建立交通事故预警系统的必要性。分析了基于人、车、路、环境四要素的道路交通事故的成因,根据交通事故预警系统设计原则和建立预警系统的目的,采用相关理论,选用合适的交通信息采集技术,建立了交通事故预警系统。该系统包括驾驶员预警子系统、车辆防撞预警子系统、车辆状况预警子系统、道路安全预警子系统和交通气象预警子系统。     

基于元胞自动机的双车道变道交通流特性研究

在庞杂的城市交通环境下,驾驶员为了寻求更快的速度,常常采用主动的换道行为。由于汽车使用量逐年增长,换道引起的交通事故经常发生。研究车辆变道行为,寻求有效措施减少交通事故的发生,对提高道路安全性具有积极的意义。本文以多车道系统中车辆变道行为为研究对象,以元胞自动机理论为基础,对比分析单向单车道、单向双车道换道行为,并运用MATLAB仿真软件进行分析,获得变道交通流的相关特性曲线。     

An anisotropic continuum model considering bi-directional information impact

In traffic flow with naturalistic driving only, stimulus information pre-dominantly comes from the preceding vehicles with drivers occasionally responding to the following vehicles through the inspection of rear-view mirrors. Such one-sided information propagation may potentially be altered in future connected vehicle environment. This brings new motivations of modeling vehicle dynamics under bi-directional information propagation. In this study, stemming from microscopic bi-directional car-following models, a continuum traffic flow model is put forward that incorporates the bi-directional information impact macroscopically but can still preserve the anisotropic characteristics of traffic flow and avoid non-physical phenomenon such as wrong-way travels. We then analyze the properties of the continuum model and respectively illustrate the condition that guarantees the anisotropy, eradicates the negative travel speed, preserves the traveling waves and keeps the linear stability. Through a series of numerical experiments, it is concluded that (1) under the bi-directional looking context only when the backward weight ratio belongs to an appropriate range then the anisotropic property can be maintained; (2) forward-propagating traffic density waves and standing waves emerge with the increasing consideration ratio for backward information; (3) the more aggressive driving behaviors for the forward direction can delay the backward-propagating and speed up the forward-propagating of traffic density waves; (4) positive holding effect and negative pushing effect of backward looking can also be observed under different backward weight ratios; and (5) traffic flow stability varies with different proportion of backward traffic information contribution and such stability impact is sensitive to the initial traffic density condition. This proposed continuum model may contribute to future development of traffic control and coordination in future connected vehicle environment.     

Transport and environment interactions: the italian framework

With road traffic in Europe forecast to increase, strategies are needed to keep transportation sector growth within the bounds imposed by a sustainable development. Research is contributing through a large number of projects dealing with transport–environment interactions. This paper reviews international research activities in this field, focusing on technological innovations, air and noise pollution prediction models, and existing tools for socioeconomic evaluation of traffic impacts on the environment. In particular, research projects of the Second Special Project on Transport (PFT2) of the Italian National Research Council (CNR) are outlined.