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Emergency vehicles such as ambulances, police force vehicles and fire fighting vehicles are required to reach their destination as quickly as possible. Any unnecessary delays experienced on them along their way could eventually cause dangerous events; leading to damages in lives or properties. One of the most important delays is the time that is consumed on travelling between the starting point and...
Vehicular Ad-hoc Networks (VANET) offer promising solutions towards infrastructureless collaborative active safety of the road vehicles. Active safety related data dissemination in vehicle-to-vehicle (V2V) communication requires reliable and real-time transmission. Broadcasting and relaying safety messages to alert the surrounding vehicles about critical driving situations is considered to be timely...
As a fundamental network property, Inter-Contact Time (ICT) determines the critical performance metrics of a vehicular ad-hoc network (VANET). In this paper, we extract the contact information from the traces of Global Positioning System (GPS) from public and semi-public vehicles in a large modern city, including both buses and taxis. By exploring the spatial and temporal properties of the contact...
To improve the operation efficiency and service levels of Bus Rapid Transit (BRT) systems, we propose a novel realtime BRT signal priority approach through two-stage green extension. For social justices, we control traffic signal lights under the people first principle after constructing BRT Internet of Things. This requests us to collect enough traffic information related to BRT vehicles, social...
Nowadays transportation systems suffer from many adversities. One of the most notorious issues is the traffic congestion. The transportation of persons and goods experiment notable delays with the consequent waste of precious resources and the rise of pollution. Actual Intelligent Transportation systems (ITS) are intended to relief the broad spectrum of challenges that affect our modern traffic infrastructures...
Although Vehicular Ad-hoc Network (VANET) is a subclass of Mobile Ad-hoc Network (MANET), some routing protocols designed for MANET, such as AODV, are no longer suitable in VANET due to the high mobility of VANET. For this reason, we propose a GPS based AODV (GBAODV) in this paper. With the support of the GPS device, we constrain the number of AODV routing packets flooding in the network and establish...
As more and more vehicles are being introduced into the urban streets every year, congestion has become a serious problem in the context of urban transport around the world. A desirable strategy to deal with such issues is to shift more people from personal vehicles to public transport by providing better service (comfort, convenience and so on). Travel time information is a vital component of many...
GPS navigators have been widely adopted by drivers. However, due to the sensibility of GPS signals to terrain, vehicles cannot get their locations when they are inside a tunnel or on a road surrounded by high-rises where the satellite signal is blocked. This incurs the safety and convenience problems. To address the issue, we propose a novel Grid-based On-road localizaTion system (GOT), where vehicles...
In this paper, we describe a framework and system architecture for sharing of information between vehicles and infrastructure with the aim of increasing intersection safety. Emerging intersection safety applications are based on location sensing and wireless communication. We show that these applications can only be realized if vehicles and intersection can both participate and share their information...
The rapid development of the wireless communications lets more and more people are used to access network services via various wireless technologies. Users expect the ubiquitous network environments to acquire information they needed anytime and anywhere. How to provide an efficient routing protocol is one of major challenges in VANETs to improve the performance in terms of packet delivery ratio,...
There is an increasing demand for the accurate travel time, however the inadequacy of traditional travel time is highlighted on urban streets relative to freeways. In this paper, the travel time on urban road network, of which the traffic lights result in much random control delay times, is divided into two components: link valid travel time (LVTT) and intersection delay time (IDT). What is more,...
In order to construct the highway networks, the road tunnels become an inevitable deign to accommodate physical environment elements (e.g., mountains and rivers) in the world. For the recent constructed tunnels, the communication system within the tunnel is planed and designed ahead of time. However, the cost to build and maintain a complete communication system for existing tunnels may not be a cost...
Vehicular Ad-hoc Network (VANET) can be envisaged as the network of moving vehicles communicating in asynchronous and autonomous fashion. Efficient and scalable information dissemination is a major challenge due to the movement of vehicles which causes unpredictable changes in network topology. Publish/Subscribe communication paradigm provides decoupling in time, space and synchronization between...
Congestion on roads and highways is an issue that leads to reductions in the energy-efficiency of travel. Current GPS navigation devices include features which provide turn-by-turn directions to vehicles based on real-time traffic conditions, and these features provide an opportunity to improve average fuel consumption. Routing strategies in these devices optimize individual travel times, but theoretical...
Many applications and protocols are planned for the so-called Intelligent Transportation Systems (ITS). Most of them are supposed to work in dynamic networks, such as the vehicular ad hoc networks (VANET). However, designing and studying distributed applications and protocols in such networks is not easy. Analytical studies suffer from the lack of pertinent models. Simulations are often far from reality...
Statistics show that the number of cars is increasing rapidly and so is the number of car theft attempts, locally and internationally. Although there are a lot of car security systems that had been produced lately, but the result is still disappointing as the number of car theft cases still increases. The thieves are inventing cleverer and stronger stealing techniques that need more powerful security...
Geographic message forwarding in vehicular ad hoc networks (VANET) has attracted much attention and become one of the most promising research areas recent years. In this paper, inspired with the intuition that drivers' route are with high regularity, we propose a prediction-based message forwarding strategy named Seer. Seer trains a 2nd-order Markov model based on long-term historic trip GPS data...
In recent years the research on Vehicular Ad Hoc Network (VANET) has been paid much attention due to the development of wireless network becoming mature, people think highly of traffic safety issue, the popularity of Global Positioning System (GPS), promising applications of VANET being exploited. However, VANET has the essential property of rapid change of large scale network topology. Besides, the...
Dynamic link impedance is an important base for dynamic traffic assignment problem. Link travel time is the main constituent of link impedance and is often directly used as link impedance. Considering the disadvantages of traditional estimation methods based on floating car, proposed an improved method to improve the accuracy of the estimates. To Sydney Coordinated Adaptive Traffic System, its detection...
Advances in wireless communication technologies as well as the low cost of wireless equipment have increased the ubiquity of network connectivity, as is illustrated by the large deployment of IEEE 802.11 access points (APs). Anytime, anywhere, users are being connected to networks and consequently they expect more services on their mobile devices. Internet access from vehicles, in particular short...
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