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Traffic wave

About: Traffic wave is a research topic. Over the lifetime, 2106 publications have been published within this topic receiving 62117 citations. The topic is also known as: phantom traffic jam & ghost jams.


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Proceedings ArticleDOI
01 Dec 1971
TL;DR: It seems reasonable to restrict the ramp flow when an accident or congestion has caused a traffic jam downstream from the ramp, at the expense of inconvenience to a few vehicles which must continue travelling on the slow road instead of entering the fast road.
Abstract: Figure 1 depicts two parallel roads, one "fast" and the other "slow", with a ramp on which vehicles from the slow roadway may be allowed to merge onto the fast road. Such a situation occurs frequently when a freeway or expressway is accompanied by a service road. It seems reasonable to restrict the ramp flow when an accident or congestion has caused a traffic jam downstream from the ramp. The traffic jam will then clear up more quickly, at the expense of inconvenience to a few vehicles which must continue travelling on the slow road instead of entering the fast road. This policy is especially valid if the fast road has more high priority vehicles, e.g., buses.

7 citations

Proceedings ArticleDOI
13 Nov 2015
TL;DR: A stability threshold is derived of a novel macroscopic model, developed to simulate the flow of ACC-equipped vehicles, and the impact of such vehicles on the stabilization of the traffic flow, with respect to small perturbations is studied.
Abstract: Since the early days of traffic engineering, traffic flow stability has attracted a lot of attention, as the frequent occurrence of traffic jams, caused by small perturbations in traffic flow such as a sudden deceleration of a vehicle, deteriorate the performance of traffic flow and the utilization of the available infrastructure. Such traffic jams are usually related to instabilities in traffic flow, resulting in the formation of stop-and-go waves, propagating upstream the traffic flow. Emerging technologies in the field of Vehicle Automation and Communication Systems (VACS), such as Adaptive Cruise Control (ACC) systems, appear to be a remedy to reduce the amplitude or to eliminate the formation of such traffic instabilities. To this end, this work aims to derive a stability threshold of a novel macroscopic model, developed to simulate the flow of ACC-equipped vehicles, and study the impact of such vehicles on the stabilization of the traffic flow, with respect to small perturbations. The adopted macroscopic approach reflecting ACC traffic dynamics is based on the gas-kinetic (GKT) traffic flow model. The analytic results show that ACC vehicles enhance the stabilization of the traffic flow; the instability region is very narrow and by reducing the ACC time-gap setting it moves to higher values of density.Copyright © 2015 by ASME

7 citations

01 Jan 1956
TL;DR: In this paper, a study was conducted to investigate the relationship between the number of vehicles that are required to stop and the amount of traffic that is allowed to continue, and it was found that the average delay to all vehicles was much greater with fixed-time control than with any other control method.
Abstract: A STUDY OF STOPPED-TIME DELAY WAS UNDERTAKEN TO PROVIDE DATA TO SUPPORT WARRANTS FOR CERTAIN TYPES OF TRAFFIC CONTROL DEVICES, AND A SIMPLE METHOD OF RECORDING THIS DELAY WAS ADAPTED FROM A PREVIOUSLY REPORTED METHOD. IT WAS FOUND THAT STOPPED-TIME DELAY TO ANY VEHICLE WHICH IS REQUIRED TO STOP IS MUCH GREATER WITH FIXED-TIME CONTROL THAN WITH ANY OTHER FORM, AND AVERAGE DELAY TO ALL VEHICLES WAS LESS AT TWO-WAY STOPS THAN WITH OTHER FORMS OF CONTROL UNDER THE MODERATE TRAFFIC VOLUME CONDITIONS OBSERVED. THERE APPEARS TO BE A POSITIVE RELATIONSHIP BETWEEN STOPPED-TIME DELAY ON A MINOR HIGHWAY AND THE VOLUME OF TRAFFIC ON THE MAJOR HIGHWAY, BUT THE DATA AVAILABLE DO NOT PERMIT DETERMINATION OF THE DEGREE OF RELATIONSHIP. /AUTHOR/

7 citations

Patent
11 Dec 2013
TL;DR: In this article, a traffic wave real-time detection and tracking method based on information fusion is proposed, in which the traffic wave position measured value at the current moment is obtained, and a double adjustable window algorithm fused with an Adaboost classifier is adopted in each vidicon in the visual area between the opposite vidicons.
Abstract: The invention relates to a traffic wave real-time detection and tracking method based on information fusion Firstly, a traffic video image is acquired, then a Kalman filtering technology is adopted, and the traffic wave state prediction value at the current moment is acquired according to the traffic wave state optimal estimated value at the last moment; then, the traffic wave position measured value at the current moment is obtained, and a double adjustable window algorithm fused with an Adaboost classifier is adopted in each vidicon in the visual area between the opposite vidicons; estimation is carried out based on a feature point tracking method and a traffic wave estimation method in the blind area of the vidicons away from each other; finally, a weighted average consistency information fusion algorithm is adopted to obtain the traffic wave state optimal estimated valve at the current moment, preparation is made for the traffic wave state prediction of the next moment, and in the process, the measurement noise weights of the vidicons are introduced, and the detection result reliability of each vidicon is dynamically adjusted to improve traffic wave locating accuracy

7 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202314
202237
202120
202017
201919
201822