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Under the emergency accidents, implementation of the rescue measures is directly related to the traffic state identification. However, lacking of information collecting caused by road damage would lead to the results of identification by conventional fixed detector had a larger deviation. Although the existing way of probe vehicle with a large coverage area but also from an environmental impact, the...
This paper aims to offer a potential solution to the traffic management problem. In order to achieve this goal we considered implementing a distributed simulator that brings together a great variety of traffic environments. By adjusting some set of parameters of the simulation, we can get an improvement on average waiting time for many crowded infrastructures, traffic fluency being a major criterion...
Intelligent transportation systems (ITS) make use of wireless communication technologies to provide traffic efficiency and road safety without altering the existing road infrastructure. To really impact on traffic management, ITS should act in real-time, requiring updated traffic information; hence, the collection of small amounts of information frequently transmitted from a high number of vehicles...
This paper discusses the influence factors of detector spacing optimization. Through the corresponding mathematical conversion, it gets the model parameters which influence the result of detector spacing optimization. IDF (Information Degree Function) is proposed to describe the spatial distribution characteristics of traffic information. Then, this paper gives the calibration method of the model...
Vehicular ad hoc networks (VANETs) are emerging as a new network environment for intelligent transportation systems (ITS). In many applications envisaged for VANETs, traffic information needs to be disseminated to relevant vehicles during a duration of time. Here we present a model of warning message dissemination in VANETs. The idea in our model is that vehicles on a stretch of roads carry warning...
Traffic signs are important means to control and evacuate traffic by providing traffic information so that it can ensure transportation safety. According to the characteristics of ring expressway construction, the article analyzes the traffic flow of highway network and concludes four models of traffic flow. Considering the purposes of traffic and traffic flowing models and technical classification...
According to the fact that the quality evaluation process of traffic information estimated by floating cars is neglected or on which models used are unreasonable in existing researches, which lead to blind application of traffic information for users, a method for estimating the reliability degree of traffic information based on floating car is designed considering sample sizes of floating car, and...
Distributed traffic information systems apply inter-vehicular ad hoc communication to disseminate road traffic information. The high amount of traffic information carried and flooded along the road network leads to superfluous forwarding, which is usually reduced by using rate- or spatial- adaptivity in the dissemination mechanisms. However, in certain cases due to the lack of context-aware information,...
With an emergence of vehicular ad hoc networks, it is highly likely that in the near future vehicles on the road will be used as mobile probes for collecting and distributing traffic information such as the travel time. Generally, the travel time on a road section can be estimated from the global positioning data collected by a mobile probe. The more frequent the positioning data are collected or...
Estimation of travel time in the analysis of network performance has been suffering from low accuracy due to errors of vehicle speed evaluation, which is affected by the way that intersection areas in the network are delineated. In this paper, two methods, the density-based and the deceleration point-based, were proposed for the purpose of dynamically delineating the intersection based on Floating...
Real-time image processing is a difficult work for traffic video monitoring. This paper proposed a method to detect and track vehicles on highway based on airship video and therefore calculate traffic parameters in real-time. A blocking road extraction was performed to determine the ROI, and automatically calculate the tilt of the road which contributes to vehicles detection. A lane marks registration...
With the wide application of global navigation and location technology, people have growing demands of solving the shortest path problem. In the real traffic network, all kinds of traffic information have greatly influenced path searching, such as traffic jams. So existing algorithms just remove the congested road and recompute the path. So the traveler needs to wait for a period of time. In order...
Massive raw traffic data such as loop data, vehicle GPS data stay undeveloped for administrative or technical purpose in transportation industries in China. Information-Service-Oriented Experimental Transportation System (IETS) aims at exploring and deducing useful traffic information from real-time collecting traffic data and publishing the information as a value-added service. Knowledge discovery...
With the rapid growth of the number of various vehicles, the ratio of the traffic accidents to vehicle number is increasing greatly. To improve road safety, it is necessary to monitor and evaluate the traffic safety degree first of all. The factors that influence the road traffic safety include the basic traffic parameters such as velocity and density, the peccancy behaviors such as overspeed, overweight...
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