雾天高速公路限速模型研究

文章通过对传统的基于停车视距和基于交通标志视认距离的雾天高速公路限速模型的分析,提出了考虑比较全面的组合限速模型,并采用保守分析与乐观分析方法对各种限速模型的计算结果进行比较,论证各种限速模型的特点和适用条件,同时还提出了不同能见度条件下的高速公路限速值和管理措施,为高速公路雾天行车安全管理提供借鉴。     

基于能见度检测的高速公路雾天智能诱导系统

为了车辆安全通过高速公路雨雾路段,文章基于能见度检测和低能见度的安全行车间距,设计出一套适应广西雨雾特殊天气条件的高速公路雾天智能诱导系统。该系统具有能见度检测、智能诱导、多元化控制、无人值守等功能,提升了高速公路运营管理水平,增加高速公路行车安全性和舒适性,降低事故发生概率。     

风雨十年铸辉煌 争创一流拓新路——广西南宁高速公路管理处

1998年7月18日,随着桂海高速公路南宁至南间段的开通,广西南宁高速公路管理处诞生了.随后,南宁高速公路管理处先后接管了柳南高速公路南段、南宁环城高速公路和都南高速公路.     

关于高速公路施工安全与文明施工的探讨

高速公路施工作业区是为高速公路新建、维修、养护作业而设置的区域,存在各种各样的施工风险.文章以高速公路施工作业区为主要阵地,以某高速公路施工项目为例,简要阐述了高速公路施工安全管理措施,并对高速公路文明施工的相关策略进行了进一步探究,希望为高速公路施工安全与文明施工的实现提供一些参考.     

论宣传报道在高速公路建设管理中的重要作用

文章结合广西高速公路项目建设发展实际,阐述了宣传报道与高速公路项目建设的关系,分析了宣传报道在高速公路建设发展中的重要导向作用,并提出了做好高速公路建设行业宣传报道工作的具体思路。     

高速公路工程试验检测技术研究

文章介绍了高速公路工程试验检测技术的发展趋势,分析了常规的高速公路工程试验检测方案,研究了高速公路工程试验的主要检测项目及要求,包括综合甲级检测项目、高速公路隧道项目和高速公路桥梁项目等,可为高速公路的工程试验工作提供相关参考依据。     

对重庆高速公路融资方式的思考

高速公路建设资金不足日益严重,融资方式的单一又局限了资金的来源渠道。目前高速公路建设主要的融资渠道是银行贷款,但高负债危机已经引起广泛关注。本文立足重庆市高速公路建设融资的现状,深入分析了高速公路建设项目的多种融资方式,提出了高速公路融资的有效方式。     

关于高速公路机电系统防雷问题的探讨

机电系统对高速公路的基础运营有着重要作用,是高速公路顺利运行的保障。文章阐述了雷电对高速公路机电设备的影响及危害,分析了雷击事故频发的一般原因,提出了加强高速公路机电设备防雷的措施及途径。     

广西高速公路建设节约集约用地的几点思考

文章以中国当前高速公路的迅速发展同土地资源紧缺之间的矛盾为切入点,以灌阳至平乐高速公路为依托工程,提出了高速公路建设节约集约用地的基本内涵,指出了目前高速公路建设节约集约用地中尚存的问题,并从多个角度提出了改进高速公路节约集约用地现状的技术措施。     

广西高速公路速度限制研究

文章分析了广西高速公路速度限制存在的主要问题,提出了改进高速公路速度限制的相关措施,对提高广西高速公路管理水平和高速公路通过率、保证行车安全及减少公路交通事故具有现实的意义。     

A model‐based demand‐balancing control for dynamically divided multiple urban subnetworks

Traffic control is an effective and efficient method for the problem of traffic congestion. It is necessary to design a high‐level controller to regulate the network traffic demands, because traffic congestion is not only caused by the improper management of the traffic network but also to a great extent caused by excessive network traffic demands. Therefore, we design a demand‐balance model predictive controller based on the macroscopic fundamental diagram‐based multi‐subnetwork model, which can optimize the network traffic mobility and the network traffic throughput by regulating the input traffic flows of the subnetworks. Because the transferring traffic flows among subnetworks are indirectly controlled and coordinated by the demand‐balance model predictive controller, the subnetwork division can variate dynamically according to real traffic states, and a global optimality can be achieved for the entire traffic network. The simulation results show the effectiveness of the proposed controller in improving the network traffic throughput. Copyright © 2016 John Wiley & Sons, Ltd.     

Study on road section environmental traffic capacity model and algorithm under double constraints

The coordinated development of city traffic and environment is a key research content in traffic field in twenty-first Century. Among them, road section environmental traffic capacity analysis is one of the important research issues. It can provide solid theoretical basis and reliable data support for road network traffic optimization control, road traffic pollution control and city traffic structure optimization. This paper analyzed main factors which impacted environmental traffic capacity from two aspects, including road capacity constraint conditions and road traffic pollution control constraint conditions. Then, road section environmental traffic capacity optimization model was established, and method of improved augmented Lagrange function was used to solve the model. Case study showed that, (1) The environmental traffic capacity optimal model and methodology were effective; (2) In order to ensure road section environmental traffic capacity greater than (or equal to) road capacity, some measures could be taken including adjusting motor vehicle type proportion as well as improving emission characteristics of motor vehicles exhausting pollutants.     

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。     

基于贝叶斯网络模型的交通状态预测

城市的交通状态是可以预测的。有效的交通状态预测能优化交通状态,减少交通阻塞。贝叶斯网络(Bayesian Networks,BN)是目前不确定知识和推理领域最有效的理论模型之一。文章在综合考虑交通阻塞成因的基础上构建网络模型,在已有的交通状态数据的基础上提出基于贝叶斯法则的学习算法,并通过计算变量间的条件概率来计算交通阻塞发生的可能性,达到预测的目的。     

福州市交通安全与智能交通系统探讨

智能交通系统是一个高科技集成系统,它综合运用各种高新技术于整个交通管理系统之中,可以系统、全面、高效地提高交通运输的安全性.文章阐述了智能交通系统在交通安全中的作用及在福州市的应用情况,指出了福州市发展智能交通的方向,以提高福州市的交通安全管理水平.     

Understanding the structure of hyper-congested traffic from empirical and experimental evidences

We study in this paper the structure of traffic under hypercongestion, which is a controversial issue between traditional two-phase traffic theory and Kerner’s three-phase theory. By analyzing video traffic data from a section of the Nanjing Airport Highway, it is found that traffic states inside hypercongestion are not homogeneous, which contradicts the existence of a “Homogeneous Congested Traffic” state claimed in two-phase traffic theory. Analysis of vehicle trajectories and velocities obtained from an experimental car-following study with a platoon of 25 vehicles also confirms the above findings. Furthermore, it is also found from the video traffic data that the structure of hypercongested traffic varies only slightly with location, which might be due to small jams inside hypercongested traffic merging into larger ones slowly and/or larger jams sometimes breaking into small ones. Finally, the implications of our observations on traffic modeling have been discussed.     

道路交通事故发生机理与实例分析

交通事故发生机理是认识道路交通事故发生过程、交通事故预防和改善交通安全的基础。文章以道路交通系统为研究对象,分析道路交通事故的形成过程,将交通事故发生机理分为驾驶行为差错类事故发生机理、外部因素突变类事故发生机理、综合性事故发生机理三类,并在此基础上绘制了道路交通事故发生机理图,同时结合国道109线兰州八盘村路段进行了实例分析。     

广西南梧公路苍梧县林水段通行能力研究

文章对南梧公路苍梧县林水段通行能力和服务水平进行了研究和比较,介绍了通行能力计算公式和参数选取过程,论证了该路段的通行能力可以满足2020年前的交通需求,并提出了提高现有公路通行能力的方法和建议。     

Estimating link travel time functions for heterogeneous traffic flows on freeways

Oversized vehicles, such as trucks, significantly contribute to traffic delays on freeways. Heterogeneous traffic populations, that is, those consisting of multiple vehicles types, can exhibit more complicated travel behaviors in the operating speed and performance, depending on the traffic volume as well as the proportions of vehicle types. In order to estimate the component travel time functions for heterogeneous traffic flows on a freeway, this study develops a microscopic traffic‐simulation based four‐step method. A piecewise continuous function is proposed for each vehicle type and its parameters are estimated using the traffic data generated by a microscopic traffic simulation model. The illustrated experiments based on VISSIM model indicate that (i) in addition to traffic volume, traffic composition has significant influence on the travel time of vehicles and (ii) the respective estimations for travel time of heterogeneous flows could greatly improve their estimation accuracy. Copyright © 2016 John Wiley & Sons, Ltd.     

A path-based flow formulation for the traffic assignment problem

In order to improve cooperation between traffic management and travelers, traffic assignment is the key component to achieve the objectives of both traffic management and route choice decisions for travelers. Traffic assignment can be classified into two models based on the behavioral assumptions governing route choices: User Equilibrium (UE) and System Optimum (SO) traffic assignment. According to UE and SO traffic assignment, travelers usually compete to choose the least cost routes to minimize their own travel costs, while SO traffic assignment requires travelers to work cooperatively to minimize overall cost in the road network. Thus, the paradox of benefits between UE and SO indicates that both are not practical. Thus, a solution technique needs to be proposed to balance UE and SO models, which can compromise both sides and give more feasible traffic assignments. In this paper, Stackelberg game theory is introduced to the traffic assignment problem, which can achieve the trade-off process between traffic management and travelers. Since traditional traffic assignments have low convergence rates, the gradient projection algorithm is proposed to improve efficiency.