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With the advance of various location-acquisition technologies, a myriad of GPS trajectories can be collected every day. However, the raw coordinate data captured by sensors often cannot reflect real positions due to many physical constraints and some rules of law. How to accurately match GPS trajectories to roads on a digital map is an important issue. Many existing methods still cannot meet stringent...
In this paper, we use the NCTUns network simulator to study intelligent traffic signal control algorithms. NCTUns is both a microscopic traffic simulator and a network simulator. We imported the real-life map of a district of the Taipei city into NCTUns to let simulated vehicles move on the roads of the imported map. Then, we used a new and unique feature of NCTUns - each simulated vehicle moves towards...
Two types of safety messages, beacons and event-driven emergency warning messages, are playing a key role in many safety-related applications of Intelligent Transportation System (ITS), which are designed for improving road safety and traffic efficiency. Every vehicle on the road periodically sends safety beacons to notify the neighbors on the road its position, speed, direction and acceleration....
Today, Intelligent Transportation System (ITS) applications has made a great impact on improving the quality and efficiency of the transportation system. This achievement has attracted researchers to propose more ITS applications, particularly to improve the transportation safety through Vehicular Ad Hoc Networks (VANETs). The major difficulty faced by these researchers is the verification of their...
NCTUns is a novel network simulator/emulator that has many unique features over traditional network simulators/emulators. It runs on Linux and many papers/projects have used it for wireless vehicular network research. According to the NCTUns website (http://NSL.csie.nctu.edu.tw/nctuns.html), as of December 24, 2009, more than 16,164 people from 137 countries in the world have registered and downloaded...
The IEEE 802.11(p)/1609 network is a promising candidate for future vehicular communication networks. Due to the deployment cost consideration, roadside units (RSUs) in such networks are usually installed only at hot spots and intersections, causing the service coverage of RSUs to be discontinuous. To overcome this problem, multihop data forwarding among vehicles can be used to extend the service...
In the widely used traditional control system, traffic coordination and control between regions are neglected. Regional boundarypsilas traffic control effect has direct influence on the input traffic flow control and output traffic flow control of the regions. In this paper, a traffic coordination and control model of regional boundary based on fuzzy control is proposed. Two fuzzy controllers are...
This paper proposes a coordination optimization method between traffic control and traffic guidance so as to alleviate traffic congestion spatially and temporally. Firstly, this paper summarizes the state of art in this field and brings forward the existing problems. Secondly, considering both network equilibrium control optimization and signal timing optimization, a coordination optimization model...
This paper uses regional saturation and speed as evaluation index, uses one of the traffic control region as research object, VISSIM as the test platform. Operation effect of different traffic control strategies under different traffic situations are simulated, so as to select the optimum traffic control strategy for corresponding traffic situation. Meanwhile, this paper proposes an adaptive traffic...
NCTUns is a novel network simulator and emulator that has many unique features over traditional network simulators and emulators. It is an open-source software running on Linux and is being used by many researchers in the world. According to the NCTUns official Web site (http://NSL.csie.nctu.edu.tw/nctuns.html), as of June 1, 2008, more than 11,546 people from 124 countries have registered and downloaded...
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