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In order to study the influence of different vehicles to incident delay, traffic simulation is applied to make the delay predictions. Three major parts, respectively the establishment of simulation platform and parameter calibration, survey and calculation of traffic data, and case study, are described in the paper. For the establishment of simulation platform and parameter calibration, at first,...
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...
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...
According to the problems of traffic flow on road, traffic status evaluation parameters and road running state, and because of relationship among road traffic flow parameters, the paper evaluates road traffic condition with AHP approach. First building evaluation levels of hierarchical structure, then giving all levels calculation formula, thus determining various index weights, next working out evaluation...
This paper presents a Priority based Routing Protocol (PRP) in Vehicular Ad hoc Network (VANET), according to message types. We focus mainly on a safety messaging application for safe driving in distributed environment, i.e., ad hoc manner. Broadcast based routing protocol is proposed along with priority and position enhancement to provide i) fully distributed routing protocol, ii) different quality...
We consider the problem of designing cooperative driver assistance and collision warning systems in vehicular networks. In this problem each car has a small size state information message that should be received by its neighborhood within a short lifetime of L timeslots. Because of the safety nature of the application, communication reliability (success probability) and delay are of critical importance...
Aiming at our air traffic congestion problems in the assessment, establish evaluation index system of air traffic congestion and provide the evidence theory assessment method in the air traffic congestion. Through the result of calculation of the example, it has validated the effectiveness and feasibility of the assessment method in the air traffic congestion.
Along with urbanization, traffic congestion increasingly affects people. Evaluation index is of great value to describe traffic jams of the city's road network or specific region, but in the field of the road intersection, current study on evaluation indicators does not sound. In this paper, point sample method is adopted to conduct field estimation on five districts and 15 Intersections of Beijing...
As the converging point and evacuating point of traffic flow, the service level of intersection is closely related to the explicit costs the drivers can bear in passing the intersection. This article applying point sample method to 5 districts and 15 intersections of Beijing and using regression analysis to propose intersection congestion index, can dynamically reflect the degree of intersection congestion;...
Generally traffic jams are grown from single spots such as intersections which have key positions in urban transportation, then the small jams came into bigger ones, until the whole region was stopped up. In order to measure the extent of traffic jams, it's necessary to define an index. Based on regression analysis on the data from 15 Intersections of 5 Beijing Districts, the Intersection Approach...
As part of the urban transportation, intersections belong to quasi-public goods. Individual vehicles will not affect others on the same intersection when traffic is smooth. But once the traffic flow exceeds the critical point, intersections' non-competitive character will disappear and exclusionary becomes conspicuous, showing all levels of traffic jams. This article first combines the transportation...
Analysis result shows that many things are grey system. According to the classical grey theory, the grey number was adopted to express the evaluation indices and clustering thresholds. Furthermore, grey number formula was presented and clustering model was built based on the trapezoid whitening weight function. The possibility idea of comparing interval number was introduced into grey number compare...
Bus lane helps to improve speed of bus and to improve service standard, which is an important mean in realizing bus priority. Arrangement of bus lane decreases traffic efficiency of other vehicles while it improves efficiency of bus. It is quite necessary to establish a comprehensive evaluation method for sake of efficiency related with public vehicles and social traffics for purpose of evaluating...
There is no one standard to evaluate traffic congestion degree of city road-network in the world, in this paper, degree of city road-network traffic congestion is divided into three classes: jam ,congestion, crowd, fluency. The indexes to evaluate the degree of city road network traffic congestion are selected, and the hierarchy evaluation index system are built with analytic hierarchy process and...
Vehicular delay-tolerant networks (VDTNs) are a promising technology for vehicular communications, creating application scenarios that enable non-real time services with diverse performance requirements. Because of scarce network resources (e.g. bandwidth and storage capacity) and node's short contact durations, the underlying VDTN network infrastructure must be capable of prioritizing traffic. This...
In this paper we propose a new class of repetition- based MAC protocols for Vehicular Ad-hoc Networks. The design can be used for safety applications and position information dissemination. An erasure broadcast channel is considered in which several vehicles are in a cluster and each vehicle attempts to send its own safety message to all other vehicles. A distributed feedback mechanism has been introduced...
There is no one standard take for granted in the world, therefore, in this paper, city road-network traffic congestion is divided into road section congestion and cross congestion, and is classified as five classes: congestion, crowd, general crowd, general unimpeded, unimpeded. The indexes for evaluation of city road network traffic congestion are selected, and the two hierarchy evaluation index...
An adaptive fuzzy logic signal controller (AFC) is presented for the urban traffic network. The AFC is composed of the signal control system-oriented control level and the signal controller-oriented fuzzy rules regulation level. The control level decides the signal timings in an intersection by a fuzzy logic controller. The regulation level optimizes the fuzzy rules by the adaptive module in AFC according...
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