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Vehicular ad hoc networks (VANETs) allow vehicles to generate and broadcast messages to inform nearby vehicles about road conditions. We propose a multi-hop announcement scheme for VANETs which supports message broadcasting and forwarding. In this scheme, we propose two algorithms to evaluate the reliability of messages and aggregate the reputation scores respectively. The major principle of the reliability...
Vehicular ad hoc networks (VANETs) allow vehicles to generate and broadcast messages to inform nearby vehicles about road conditions, such as traffic congestion and accidents. Neighboring vehicles can utilize this information, which may improve road safety and traffic efficiency. However, messages generated by vehicles may not be reliable. We propose a novel announcement scheme for VANETs based on...
With an increasing emphasis on public transits, the level of service (LOS) provided has gained more attention than ever. In this paper, we aim to evaluate the reliability of the public bus service via the abundant data of GPS and Smart Card. Three indexes (PIL, PIS, and DIS) are taken into consideration; a comprehensive evaluation of Bus No.757 in Shanghai is achieved by the collaboration of these...
In this paper, we study pattern preserving path following control of unicycle teams with communication delays. The pattern of the vehicle team is said to be preserved if the distance between it and the desired one remains in some given range. A virtual vehicle formation is introduced such that each virtual vehicle becomes the pursuit target for the corresponding real vehicle. First, an input-driven...
In this paper, virtual structure and artificial potential field (APF) based strategies are integrated to realize formation tracking control for a team of unicycles with collision avoidance property. Using virtual structure, each vehicle is required to track a virtual local leader (VLL) for formation maintenance. For inter-vehicle collision avoidance, the motion of each vehicle is restricted in a specified...
Traffic system is a dynamic complicated one which is constituted of some factors. Traffic accident will happen if these factors mismatch with each other. Safety level of traffic accident scene affects occurrence rate of secondary accident. In order to evaluate safety level of traffic accident scene, prevent from secondary accident happening and protect the policemen, crowds by the scene and party...
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