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Vehicular Ad-hoc Networks (VANETs) are increasingly used to support critical services that improve traffic safety and alleviate traffic congestion. Developing VANET-based services and applications, however, is hindered due primarily to limited and often fluctuating communication capacity of VANETs that stem from the wireless and mobile nature of vehicle-tovehicle (V2V) communications. To address this...
GSM based security system are much more stout then an ordinary security system. The ordinary systems are simply based on the concept of sensors. They sound an alarm on detecting movement. This system of technology has now lost its appeal as it has become a common sighting in metros where these alarms go off unnecessarily. We proposed with GSM techniques and a better decision making process is built...
Intelligent Traffic Management (ITM) system promises to reduce the traffic congestion, intelligent intersection management as well as the smart dissemination of the informatics to control the traffic flow. Development of any Intelligent Transportation System (ITS) applications requires realistic road traffic model to analysis the performance. Service rate or service time is one of the most important...
In this paper, the first results to show the power, bandwidth and RMS delay spread of an intra-vehicle optical wireless communication system from a passenger perspective are presented. This work builds upon a previous investigation of ours which had demonstrated potential for optical wireless deployment within a vehicle as a potential competitor to RF based systems. By now incorporating the presence...
In this paper we present a novel vehicular communication protocol, which aims to reduce the effect of broadcast storm problem in VANETs. When the traffic density is above a certain value (e.g., when vehicles are in congested traffic scenarios), one of the most serious problems is the increase of packet collisions and medium contentions among vehicles which attempt to communicate.
Urban area traffic signal control is a complicated issue. Based on the characteristics of vehicle delay, this paper proposes a method for signal timing and phase optimization. Particle swarm optimization (PSO) is adopted to optimize the multiphase traffic signal timing and phase sequence at the intersection. The optimization objective is to minimize the average vehicle delay of every cycle at the...
To solve the signal control problems created by the mutual interference between motor traffic and pedestrians in cities, the signal control model with pedestrians non-complying is proposed based on the traditional signal optimization model. A particle swarm algorithm is proposed to solve the signal control problem. Based on an intersection of Tianhe district in Guangzhou City, the model is calculated...
In order to represent the road traffic conditions accurately, and overcome the insufficient of single evaluation factor, it is necessary to build traffic congestion evaluation system. Firstly, the average travel speed, the average delay per unit distance, the average stop number per unit distance, the average stops time per unit distance and the saturation of road sections are selected to build traffic...
With the development of the transit-oriented mode, lots of bus routes run on urban expressway and bus stop located at isolation belt between urban expressway and assistant-road. Based on the consideration of the car-pedestrian conflicts on assistant-road, this paper proposed a new design method of pedestrian crossing facilities on urban expressway. First, the crossing types have been described through...
IEEE 802.11p is an emerging standard which provides vehicular safety communication through wireless networks. In this paper, the architecture of Wireless Access for Vehicular Environment (WAVE) and IEEE 802.11p standard were analysed. The key parameters of this standard are implemented in ns-2 network simulator to accurately simulate vehicular ad hoc networks (VANETs). The performance of this standard...
Vehicular network is different from wired network due to its network environment changes rapidly. The connection lifetime between vehicles is usually short because vehicles move in high speeds. Hence, deploy peer-to-peer (p2p) applications over vehicular network is a challenging research issue. There are many problems confronted in p2p file sharing, e.g. how to search files effectively, how to share...
Next-generation traffic management systems will make use of on-board intelligence and communication capabilities of vehicles and traffic infrastructure. In this paper, we investigate a multiagent approach allowing vehicle agents to form groups in order to co-ordinate their speed and lane choices. Our hypothesis is that a decentralized approach based on a co-operative driving method can contribute...
Vehicular Ad-hoc Network (VANET) is among the most relevant forms of mobile ad-hoc networks. VANET helps improving traffic safety and efficiency. By exchanging information between each others, vehicles can warn drivers or even prepare for dangerous situation. These warnings can be about critical situations like vehicles merging in a highway. Detecting and warning about such situations require a reliable...
Platooning with IVC-enabled autonomous vehicles may enable a significant increase in lane capacity, if performed with constant spacing policies. However, to be effective, such system is very demanding with respect to communication performance and reliability. Dedicated short range communications (DSRC) is the prominent intervehicle communication (IVC) technology. However, its reliability rises concerns...
Too slow acceleration of cars downstream a traffic jam can have a dramatic impact on the jam's lifetime and cause much delay for motorists behind. It has been observed that cars leaving a traffic jam reach cruise speed much later than predicted by car-following models and space headway to the car ahead tends to be long. Using traffic flow simulation we have quantified the delays caused by such driving...
With the increasing demand for traffic safety and efficiency and constant search for innovative solutions within the automotive market coupled with supporting initiatives from regulatory (governmental) domains, the potential of Intelligent Transportation Systems (ITS) is vast. Basic vehicle and roadside infrastructure collaboration allows an increase in efficiency and safety and acts as the foundation...
Efficient data dissemination to a fixed number of receivers in VANET is a new issue and is challenging considering the dynamic nature of VANET. We aim to accurately control the number of receivers, achieve low dissemination delay and incur only small communication overhead. To achieve the goal, we design DOVE (Data Dissemination to A Fixed Number of Receivers in VANET) inspired by processor scheduling,...
To improve safety, a warning message in VANETs should be delivered both reliably and urgently. Existing solutions either tend to compromise propagation delay or do not reach high reliability due to broadcast storm problem caused by excessive retransmissions. We propose ReC, which exploits geographical information to help nodes autonomously achieve agreement on forwarding strategies. Each forwarding...
The non-recurrent congestion caused by incident happens frequently in urban traffic network and influences normal operation of traffic system greatly, so that studying on congestion control strategies under propagation of non-recurrent congestion is very important. The aim of this dissertation is to investigate the spatio-temporal distribution of traffic flow and location of variable message sign...
One of the most challenging factors in the development of autonomous vehicles and advanced driver assistance systems is the imitation of an expert driver system which is the observer and interpreter of the technical system in the related driving scenario. In this paper, a multimodal adaptive driver assistance system is presented. The main goal is to determine the human driver's attention and authority...
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