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In the light of more traffic status variables are considered under low traffic flow in traffic intensity-based two-stage fuzzy control for urban traffic signals, thus leading to the inefficiency of traffic states weakening at isolated intersections. This paper introduces a two-stage combination fuzzy optimal controller for traffic signals at urban isolated intersections: the proposed controller adopts...
This paper analyses the performance of a new routing protocol for vehicular delay-tolerant networks, called GeoSpray. This geographic routing protocol performs a store-carry-and-forward, combining replication and forwarding/ routing decisions based on location information, with explicit delivery acknowledgments to improve network resources utilization. The performance of the proposed routing protocol...
A separate turn phase is often used at intersection with heavy left turns. This wastes capacity on the approach because some of its lanes cannot discharge during its green phases. The problem can be eliminated by reorganizing traffic on all the lanes upstream of an intersection using a mid-block pre-signal. To evaluate the effectiveness of the pre-signal control system, this study has also conducted...
Congestion in road network results in prolonged travel time to the general public, adds extra cost to economic activities, and raises the pressure on road safety and environment. Traffic signals are an elementary component of all urban road networks and play a critical role in controlling the flow of vehicles. However, current road transportation systems and traffic signal implementations are very...
This research categorized U-turn at Signalized Intersections into mainly four modes, designating them as Mode A,B,C,D: Mode A, at the Downstream Section of the Stop Line; Mode B, at Upstream Section of the Stop Line; Mode C, at the Right Side of the Ingress; Mode D, at the Upstream Section of the Transition Zone. We first evaluate their respective efficiency level, and then set up an efficiency evaluation...
Traffic signal control is a challenging task for traffic systems. As fuzzy logic is proved to be well suited to control some complex systems with uncertainties and human perception, it has been widely used to control the traffic signal in recent years. This paper proposes a novel fuzzy logic controller for signalizing modern roundabouts. Different from existing fuzzy traffic-signal controllers, the...
Testing and improving commercial traffic software remain as important research topics in the last three decades. Many previous approaches emphasized the driving behaviors of uninterrupted flows (e.g. car-following and lane-changing features) but paid less attentions to the driving behaviors of interrupted flows. In the paper, the distribution of reproduced departure headways at signalized intersection...
This paper is focused on the electric power management required on garages where plug-in vehicles are located. As the Electric Vehicle technology becomes more efficient and sophisticated, parking infrastructures should be analyzed as new potential high concentrated electric consumption nodes. Simulation techniques have been implemented to analyze possible benefits of implementing a consumption management...
In current vehicles, a large number of control units are connected by several automotive specific communication buses, facilitating innovative distributed applications. At the same time, computers and entertainment devices use IP and commodity communications technology like Ethernet to connect to the Internet, allowing for innovative solutions and maintaining fast innovation cycles. Today, one can...
In this paper, we introduce a simulation model of traffic flow based on Mixed Logical Dynamical (MLD) system approach. The simulation model of traffic flow includes the effect of human reaction delays. The feature of resulting model is evaluated with typical simulations.
The fuzzy control algorithm that carries on the intelligent control twelve phases three traffic lanes single crossroads traffic light, works well in the real-time traffic flow under flexible operation. The procedures can be described as below: first, the number of vehicles of all the lanes can be received through the sensor, and the phase with the largest number is stipulated to be highest priority,...
A guaranteed cost control method for autonomous vehicle platoon with communication constraints (such as quantization, time-delay and packet-losses) is developed in this paper. Firstly, a vehicle model is established for the platoon's longitudinal movement, which is shown to be a great improvement of the existing models in that networked communication constraints are considered. Then, a guaranteed...
In order to eliminate accident, reduce congestion and improve the efficiency of the traffic circle, three effective and feasible methods are proposed.As an example,the traffic circle flow of the circle in Xiamen China is simulated by these methods above using VISSIM soft.The results of simulation show that three methods applied to different traffic flow each,then we did further simulations to the...
With the extension of wireless technology, vehicular ad hoc networks (VANETs) provide general data transmission services and emergency warning services. To rescue more drivers from being involved in an emergency event on the road, fast emergency message propagation is an important issue in VANET studies. There are two types of multi-hop broadcasting forwarder selection schemes for emergency broadcasting,...
Heavy truck and bus manufactures in automotive applications extensively use the SAE J1939 protocol definition. In this paper, the SAE J1939 protocol base on CAN bus was discussed. The real-time parameter is a key point of protocol's performance evaluation. The most important thing is to give an effective and reasonable method to simulation. Based on the analysis of the Data Link layer of CAN bus protocol,...
A new cross layer path selection scheme with quality of service (QoS) support along urban areas is proposed. First, we introduce a cross-layer approach where the routing decision takes explicit consideration of the application layer objective function. Second, the queueing based mobility model, spatial traffic distribution and probability of connectivity for sparse and dense Vehicular Ad-Hoc Networks...
Intelligent Transportation Systems (ITS) have been under development since the 80's as part of a global strategy for solving many of our modern life transportation problems. These systems enable people to reach their destinations in a safe, efficient, and comfortable way. In order to reach that goal, several radio access technologies (RAT) such as UMTS, WiFi, WiMAX and 5.9 GHz have been proposed for...
Aimed at the problem of multi-objective optimization, solution on the oversaturated signalized intersection by using fuzzy logic control (FLC) is presented. The essential and characteristics of multi-objective optimization in urban traffic signal control are analysed. The performance measures of minimizing average delay, stop times and average queue length are established, according to the initial...
This paper proposes new MAC layer based back-off and retransmission strategies for throughput enhancement, in broadcast transmissions of inter vehicular communication. We present adaptive back off strategy which is based on the concept that there exists an optimum contention window (CW) period in a broadcast CSMA/CA system, given the fixed number of users. We also propose a simple probabilistic approach...
In this paper, a new MAC protocol, called Reliable Busy Tone Multiple Access with Neighboring Information Table (RBTMA-NIT), is proposed for safety applications in Vehicular ad hoc networks (VANETs). Derived from the conventional busy tone multiple access (BTMA), RBTMA-NIT introduces three mechanisms to reduce the transmission delay of emergency messages: 1) the original emergency message and its...
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