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Yang L.-L.,Beijing STONE Intelligent Transportation System Integration Co. | Yang Y.-H.,China Institute of Technology | Hou X.-Y.,Beijing STONE Intelligent Transportation System Integration Co.
Jiaotong Yunshu Xitong Gongcheng Yu Xinxi/Journal of Transportation Systems Engineering and Information Technology | Year: 2011

Providing flexible and convenient services, taxi becomes one of the most important modes of passenger transport in many major cities of China. However, the increasingly popular taxis have brought several problems to urban traffic. This study explores the characteristics and safety of the following behaviors of taxis on urban road. It is observed that taxis run with smaller following spaces than the ones between public vehicles of other types. Furthermore, the safety of following behaviors of taxis is examined in a quantificational manner with the proposed models. In terms of the numerical examples, the risk-taking following behavior increases the possibility of crashes. The variable of following space can be selected as a predictor of accidents.


Wang F.,Beijing University of Posts and Telecommunications | Xiong J.,Beijing STONE Intelligent Transportation System Integration CO. | Zuo Q.,Beijing University of Posts and Telecommunications | Meng X.,Beijing University of Posts and Telecommunications
IET Conference Publications | Year: 2012

In this paper, based on the access of 2G, 3G(GSM, CDMA2000,TD-SCDMA,WCDMA, WIFI,etc.), it proposes a method of real-time transmission of large-capacity video information obtained by the high-definition e-police, which can adjust the video frame rate dynamically according to the stability and width of mobile internet, and finally the video data could be transmitted rapidly which meets the demand for viewing real-time information maximally.


Chen E.-H.,Beijing Stone Intelligent Transportation System Integration Co. | Liu J.,Beijing Stone Intelligent Transportation System Integration Co. | Zhao H.,China Power Engineering Consulting Group Corporation
ICTIS 2013: Improving Multimodal Transportation Systems - Information, Safety, and Integration - Proceedings of the 2nd International Conference on Transportation Information and Safety | Year: 2013

Variable message signs can display a variety of information, and the text layout is one of the factors which affects the driver's visibility. This paper studies the impact of the arrangement, letter spacing, and line spacing of the text of variable message signs on driver recognition time. The results show that word structure is the most important factor affecting recognition time. A shorter recognition time was achieved when the same word was displayed along one line as opposed to two. In addition, if the impact of word structure is not considered, a shorter recognition time resulted when the same phrase and text was displayed in an arrangement of two lines instead of one or three lines. When text spacing is increased, the recognition time first decreases and then increases; with the increase in text line spacing, recognition time reduces. © 2013 American Society of Civil Engineers.


Chen D.,Beijing Jiaotong University | Chen L.,Macau University of Science and Technology | Liu J.,Beijing STONE Intelligent Transportation System Integration CO.
Applied Soft Computing Journal | Year: 2013

This paper develops two soft computing models, i.e., the multilayer feedforward network (MFN) based model and the adaptive-network-based fuzzy inference system (ANFIS) based model, to mine the traffic speed patterns/trends for a road link using the sparse historical probe vehicles (PVs) data at the same link. The two models and an additional naive arithmetical average model are tested on the field datasets obtained in some Beijing (China)'s urban expressways. The results illustrate that the soft computing based models have higher robustness to the problem of missing data and their generalization capabilities are better than the arithmetic average model. Comprehensively considering all the performance metrics suggest that the ANFIS offers the best model of traffic trends in studied links. Furthermore, the traffic trends produced by ANFIS provide us the opportunities to identify some meaningful hidden traffic speed patterns. The missing data's influence on the mined traffic speed patterns is also investigated. It is found that the reliability of mined traffic speed patterns decreases with the increasing of the missing data's percentage. Nevertheless, ANFIS based model shows great robustness to the missing data problem. © 2013 Elsevier B.V. All rights reserved.


Yang S.-J.,Beijing STONE Intelligent Transportation System Integration Co. | Peng H.-Q.,Beijing Jiaotong University | Wang X.,Beijing Railway Bureau
Jiaotong Yunshu Xitong Gongcheng Yu Xinxi/Journal of Transportation Systems Engineering and Information Technology | Year: 2011

Design of traffic signs will affect the route choices of drivers and affect the efficiency of road utilization. This research analyzes the characteristics of the traffic flows of various types of vehicles coming into and going out of the Beijing Southern Railway Station. It is found that the traffic signs on the roads near the Beijing South Railway Station are not enough, and some of the existing traffic signs are discontinuous, irrationally established or unreasonably located. These problems are summarized according to the principle of information coherence and clearness. Finally, the countermeasures are proposed base on the characteristics of the traffic flows around the Beijing Southern Railway Station and the design principle of traffic signs.


Chen D.-W.,Beijing Jiaotong University | Pei L.-J.,Beijing Jiaotong University | Liu J.,Beijing STONE Intelligent Transportation System Integration Co.
Proceedings of the 29th Chinese Control Conference, CCC'10 | Year: 2010

In this paper, releasing range model of traffic guidance information is formulated based on combinatorial optimization by the correlation analysis of road traffic flow in time and space. As it is hard to get the optimal solution in a limited time through analysis, a greedy algorithm and a simulated annealing (SA) based algorithm are presented to solve the model. Some traffic flow data detected by remote microwave sensors in some road links in Beijing urban expressway are employed to compare the two algorithms. The results show that SA based algorithm has achieved better result even its running time is little longer than the greedy algorithm. Therefore the proposed SA based algorithms can be used to improve the pertinency, validity and automation of releasing traffic guidance information.


He Z.-B.,Beijing Jiaotong University | Guan W.,Beijing Jiaotong University | Fan L.-L.,Beijing Jiaotong University | Guan J.-Z.,Beijing STONE Intelligent Transportation System Integration CO.
Jiaotong Yunshu Xitong Gongcheng Yu Xinxi/Journal of Transportation Systems Engineering and Information Technology | Year: 2014

A macroscopic fundamental diagram(MFD) gives an invariant functional relationship among macroscopic variables in a large urban area. Beijing as one of the largest cities in the world has a number of unique traffic features. A MFD is presented for Beijing urban ring freeways by using traffic detector data. It shows the characteristics of a MFD pertaining to Beijing urban ring freeways, and provides insight into traffic conditions in Beijing. A pattern that lower occupancy variance is associated with lower network flow is observed; it is different from present findings. The observation is investigated and is further attributed to outsync of 5th ring and a radial spread of congestion in Beijing.


Yuan S.-P.,China Tietong | Qi K.,Beijing Jiaotong University | Guan J.-Z.,Beijing STONE Intelligent Transportation System Integration Co.
Jiaotong Yunshu Xitong Gongcheng Yu Xinxi/Journal of Transportation Systems Engineering and Information Technology | Year: 2011

Variable Message Signs (VMS) system is applied in the trunk road networks in the major cities of China, and plays a positive role in releasing traffic jams. In this research, the development, working principle, information generation, etc. of the urban traffic flow guidance system which is based on VMS are introduced in detail. Meanwhile, the previous research on the traffic flow guidance at home and abroad is reviewed. With the analysis of the requirements of the VMS users and the factors influencing the site distribution of VMS, the location choice model of the VMS is improved by following the principle of the VMS location choices and analyzing the effect of the guiding information on route choices. The impact of the VMS applied for the roads near Beijing South Railway Station is analyzed.


Liu J.,Beijing STONE Intelligent Transportation System Integration Co. | Sun R.,Beijing STONE Intelligent Transportation System Integration Co. | Zhou L.-S.,Chinese Research Institute of Highway
ICTIS 2011: Multimodal Approach to Sustained Transportation System Development - Information, Technology, Implementation - Proceedings of the 1st Int. Conf. on Transportation Information and Safety | Year: 2011

The drivers' compliance rate of guidance information is increased step by step when the traffic is changing from smooth to congested, or the guidance information is disseminated from mono-source to multi-source. Therefore, the guidance effect can be heightened by exaggerating the magnitude of traffic jam properly and/or disseminating the traffic guidance information in various sources. Considering the drivers' compliance rate of guidance information under different situations, the paper builds four expression models of guidance information (MSDM, MSEM, BSDM, and BSEM). When the traffic flow growth of a link is too high as to exceed the threshold, one expression mode can be selected to increase drivers' compliance rate of guidance information, make the growth close to the expected value, and achieve the purpose of unloading finally. © 2011 ASCE.


Jiang G.,Beijing STONE Intelligent Transportation System Integration Co. | Liang Y.,Beijing Traffic Management Bureau | Guan J.,Beijing STONE Intelligent Transportation System Integration Co.
ICTIS 2011: Multimodal Approach to Sustained Transportation System Development - Information, Technology, Implementation - Proceedings of the 1st Int. Conf. on Transportation Information and Safety | Year: 2011

In June 2008, the bus signal priority expand engineering of traffic signal control system was put into effect in Beijing. RFID (Radio Frequency Identification) technology as the bus-vehicle detector was used widely. RFID detection technology became mature in bus signal priority control at intersections. This paper first introduces the RFID operating principle, the method of installation and the application effect of the bus signal priority. At last, this paper gave some prospects of the application of RFID that used in traffic signal control for emergency vehicles such as fire truck, emergency ambulance, traffic police vehicles, and so on. © 2011 ASCE.

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