借助"比较优势"再攀运输高峰——河北省道路运输管理局局长于志伟专访

2003年以来,河北省道路运输管理部门结合行业实际,提出了"抓重点,促发展,抓科技,上档次,抓重点,求突破"的发展思路,明确了"以人为本",依法行政,安全稳定,科学发展"的发展理念.     

网络话题

热心的网友总能提出各种各样的问题,当然,我们不能苛求网友提的问题能"一针见血",或者,总能提出一些新问题。不过,有时候,网友确实是"与时俱进"了,他们根据正在发生的事情,提出了自己的问题,但还是有人觉得这些问题是老问题,那么,症结就不在网友,而在环境了。大型汽车集团对客车总是有"野心",有"想法",但也好像不是很重视,于是,他们在客车行业中,姿态甚高,但成绩却并不理想,而且颇有反反复复的态势。今年客车行业整体态势不错,有几个汽车集团,也在今年高调进军,成绩如何,看网友如何议论。     

希望花儿开 朵朵放光彩

莘莘的学子,当你迈着矫健的步伐前行,有多少人在为你默默地祝福,有多少人在为你保驾护航,在你迈向康庄大道的途中,还有无数默默为你奉献的,素昧平生的可人儿,那些奉献大爱的人们……不见不散的约定一座大山,一架小桥,一片爱心,一次凝聚,永恒的瞬间被幸福地定格     

道路运输企业要做成本管理巨人

在市场竞争中,企业要生存和发展,只有两手抓,一手抓顾客,提高顾客满意度,培养忠诚顾客群,扩大市场占有率;另一手抓降低成本,增加经济效益,也就是外拓市场,内抓管理.     

虽千万桥吾往矣——纪念首座“茅以升公益桥”竣工

当爱心小桥在重庆市彭水自治县竣工的那一刻,孩子们笑了,村民们笑了,志愿者们笑了,为小桥付出心血的人们都笑了。那一刻是满足,那一刻是凝聚,那一刻是传承,那一刻是心灵的共鸣。"道之所在,虽千万人吾往矣。"道之所在,虽千万桥吾往矣。修桥过程是枯燥的、艰难的,但想到人心所向的小桥能够造福一方百姓,关注小桥工程的爱心人士们都会勇往直前,     

蜿蜒坎坷 蜀道实难——G108四川荥经段亲历记

蜀山苍苍,青衣泱泱,严道有名,秦汉已扬。如今的荥经县,唐武德三年(620年)方有此名,秦惠文王更元之十三年(前31 2年)置县名严道。位于四川盆地西缘,雅安市中部,是古代南丝绸之路的重要驿站。汛期又至,空气清新,路面却泥泞不堪,坎坷难行。在蜀山间盘旋颠簸,感受风间林隙呼啸过耳,静态大石山头欲落、动态瀑     

杨传堂履新

在8月1日召开的交通运输部领导干部大会上,中组部王尔乘副部长对杨传堂有一段介绍。他说,杨传堂同志政治上坚定,经过多岗位特别是复杂艰苦环境的锻炼,领导经验丰富,熟悉党务和经济工作。思路清晰,组织领导和驾驭全局的能力比较强。敢于负责,处事果断,推动工作力度大。事业心强,工作热情高,重视调查研究。作风民主,善于听取各方面意见,注意调动大家的积极性。为人正派,团结同志,要求自己严格。中央认为,杨传堂同志是交通运输部主要领导的合适人选。     

交通运输部部长政策咨询组调研皖江侧记 心系皖江 情牵交通

<正>仲春时节,潮涌皖江。三月的江淮大地,草木萌动,繁花似锦,处处焕发着盎然生机。3月26日至28日,以交通运输部总规划师戴东昌为组长的部长政策咨询小组20多名专家莅临安徽,分赴安徽省安庆、池州、铜陵、芜湖、马鞍山等沿江城市,调研皖江城市带承接产业转移示范区交通运输发展规划情况。专家们每到一地,当地党政主要领导都出席座谈会、陪同调研,听汇报,看展板,登码头,进工地,一丝不苟,一言一行都显出心系皖江发展,情牵交通跨越。     

87台欧辉客车出口缅甸顺利交车

7月13日,在福田欧辉客车广东工厂举办87台欧辉客车出口缅甸交车仪式。87台出口缅甸大客车全部为先锋系列BJ6800U6AFB,采用玉柴YC4G180发动机,性能稳定可靠,耐用且油耗低,多片簧悬架,运行平稳舒适,噪音小,车内人性化设计,空间宽敞,操纵方便,     

德国:发达国家的自行车热

在德国,你要是没有一辆属于自己的自行车,就有一种危机感,别说出门不方便,别人也会瞧不起你,说你太跟不上形势,甚至说你"抠门"、"小气鬼"。交通工具发展真是三十年河东,三十年河西,当汽车在德国饱和后,自行车又重返交通线,交通返古理由之一就是利健康、利环保。人手一辆自行车德国过去无疑是一个车轮子上的国家,可现在却成了自行车大国。德国有8200万人口,目前拥有7000多万辆自行车,     

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。     

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。     

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.     

Analysis of Characteristics of the Dynamic Flow-Density Relation and its Application to Traffic Flow Models

Abstract

Online traffic flow modeling is of increasing importance due to intelligent transport systems and technologies. The flow-density relation plays an important role in traffic flow modeling and provides a basic way to illustrate traffic flow behavior under different traffic flow and traffic density conditions. Until now the research effort has focused mainly on the shape of the relation. The time series of the relation has not been identified clearly, even though the time series of the relation reflects the upstream/downstream traffic conditions and should be considered in the traffic flow modeling. In this paper, the dynamic flow-density relation is identified based on the classification of traffic states and is quantified employing fuzzy logic. The quantified dynamic flow-density relation builds the basis for online application of a macroscopic traffic flow model. The new approach to online modeling of traffic flow applying the dynamic flow-density relation alleviates parameter calibration problems stemming from the static flow-density relation.     

Characteristics of truck traffic in Singapore

This paper presents the results of a project conducted to study the characteristics of truck traffic in Singapore. Detailed traffic surveys recording counts of vehicles by axle-configuration were performed at 219 sites over a period of nearly two years. The surveys covered 5 different road classes, namely expressways, arterials, collectors, industrial roads and local roads. It was found that the time distribution of truck travel were not the same among the five road classes. The peaking characteristics of truck traffic were less pronounced compared to passenger car traffic. The peak hour truck volume varied from 67.0% to 9.7% of the daily truck traffic as compared to 13.8% for passenger car traffic. The lane distribution pattern of truck traffic was studied in detail by road class, and was found to be a function of total directional traffic volume, total directional truck volume and the number of traffic lanes. Composition analysis was also carried out to study the lane use characteristics of single- and multiple-unit trucks.     

低碳经济背景下河谷型城市交通级配体系研究

文章针对交通方式的合理比例分配问题,提出了交通级配的概念,构建了城市交通级配体系,并基于对西部河谷型城市道路网络特征的分析,以兰州市为例,提出了相应的交通管理措施,为城市绿色交通建设的实现提供方法借鉴。     

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。     

How to assess the benefits of connected vehicles? A simulation framework for the design of cooperative traffic management strategies

Advances in Information and Communication Technologies (ICT) allow the transportation community to foresee dramatic improvements for the incoming years in terms of a more efficient, environmental friendly and safe traffic management. In that context, new ITS paradigms like Cooperative Systems (C-ITS) enable an efficient traffic state estimation and traffic control. C-ITS refers to three levels of cooperation between vehicles and infrastructure: (i) equipped vehicles with Advanced Driver Assistance Systems (ADAS) adjusting their motion to surrounding traffic conditions; (ii) information exchange with the infrastructure; (iii) vehicle-to-vehicle communication. Therefore, C-ITS makes it possible to go a step further in providing real time information and tailored control strategies to specific drivers. As a response to an expected increasing penetration rate of these systems, traffic managers and researchers have to come up with new methodologies that override the classic methods of traffic modeling and control. In this paper, we discuss some potentialities of C-ITS for traffic management with the methodological issues following the expansion of such systems. Cooperative traffic models are introduced into an open-source traffic simulator. The resulting simulation framework is robust and able to assess potential benefits of cooperative traffic control strategies in different traffic configurations.     

Application of advanced sampling for efficient probabilistic traffic modelling

In probabilistic traffic models, consideration of stochasticity in the dynamics of traffic gives a closer representation of a traffic system in comparison to that of a deterministic approach. Monte Carlo simulation is a broadly accepted method to consider variations in traffic within modelling. In this contribution, the possibility of increasing the efficiency of probabilistic traffic flow models using Monte Carlo simulation is analysed using variance reduction techniques and sequencing, for varied capacity and traffic demand values. The techniques of Importance Sampling, Latin Hypercube Sampling and Quasi-Random Sequencing are compared in a dynamic macroscopic traffic model to demonstrate the effectiveness of these techniques for reduction of the computational load when considering multiple input variations. Demonstration of their efficiency in traffic modelling is expected to lead to a wider application of the methods in practice.