Topic
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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TL;DR: A linear stability analysis is performed to find the stability threshold of heterogeneous traffic flow using microscopic models, particularly the effect of intelligent vehicles on heterogeneous (or multi-class) traffic flow instabilities.
130 citations
Patent•
30 Mar 2005TL;DR: In this article, traffic information provided to a vehicle navigation device is refined by comparing the average speed of the vehicle against the average speeds of other vehicles traveling along the same road, and the operation of a traffic signal is controlled based on current traffic flow and distance from the traffic signal to alleviate traffic congestion.
Abstract: Traffic information, including traffic flow information and traffic incident information, obtained through a traffic management system for providing and facilitating the exchange of traffic information between a remote location and a vehicle may be presented to a user on a user display in the vehicle. In one embodiment, traffic information provided to a vehicle navigation device is refined by comparing the average speed of the vehicle against the average speed of other vehicles traveling along the same road. In another embodiment, the operation of a traffic signal is controlled based, in part, on the current traffic flow and distance from the traffic signal to alleviate traffic congestion.
128 citations
TL;DR: Two different deterministic microscopic traffic flow models, which are in the context of the Kerner's there-phase traffic theory, are introduced and it is found that the ATD and SA models show spatiotemporal congested traffic patterns that are adequate with empirical results.
Abstract: Two different deterministic microscopic traffic flow models, which are in the context of the Kerner's there-phase traffic theory, are introduced. In an acceleration time delay model (ATD model), different time delays in driver acceleration associated with driver behaviour in various local driving situations are explicitly incorporated into the model. Vehicle acceleration depends on local traffic situation, i.e., whether a driver is within the free flow or synchronized flow or else wide moving jam traffic phase. In a speed adaptation model (SA model), vehicle speed adaptation occurs in synchronized flow depending on driving conditions. It is found that the ATD and SA models show spatiotemporal congested traffic patterns that are adequate with empirical results. In the ATD and SA models, the onset of congestion in free flow at a freeway bottleneck is associated with a first-order phase transition from free flow to synchronized flow; moving jams emerge spontaneously in synchronized flow only. Differences between the ATD and SA models are studied. A comparison of the ATD and SA models with stochastic models in the context of three-phase traffic theory is made. A critical discussion of earlier traffic flow theories and models based on the fundamental diagram approach is presented.
127 citations
Journal Article•
TL;DR: The value of different measures of traffic performance, including volume, speed, and direction, including variations in Individual Speeds and Direction, and the value of the control system requirements were considered.
Abstract: THE CONGRESS STREET EXPRESSWAY SURVEILLANCE PROJECT INVESTIGATED THE INTERDEPENDENCE OF CERTAIN FREEWAY OPERATIONAL CHARACTERISTICS WITHIN A MOVING TRAFFIC STREAM BY MEANS OF ELECTRONIC TRAFFIC SURVEILLANCE EQUIPMENT. LANE OCCUPANCY, WHICH IS A POINT MEASUREMENT COMPARABLE WITH CONCENTRATION, WAS COMPARED TO VOLUME AND SPEED, AND THE INTERRELATIONSHIP WAS RECORDED. LANE OCCUPANCY WAS USED TO PREDICT VEHICLE SPEEDS WITH REASONABLE ACCURACY. AERIAL PHOTOGRAPHS WERE USED TO COMPARE OCCUPANCY AND AERIAL DENSITY OF TRAFFIC. THE COMPARISON EMPHASIZED THE CONTRAST BETWEEN POINT MEASUREMENTS AND SECTION MEASUREMENTS. TRAFFIC CONGESTION WAS DISCUSSED AND A POSSIBLE DEFINITION OF CONGESTION WAS DEVELOPED. SPEED INVERSION WAS DESCRIBED. THE VALUE OF VARIOUS MEASURES OF TRAFFIC PERFORMANCE INCLUDING VOLUME, SPEED, SPEED DIFFERENCES, HEADWAYS AND OF VARIATIONS IN INDIVIDUAL SPEEDS, SPEED DIFFERENCES AND HEADWAYS FOR PREDICTING THE ADVENT OF CONGESTION WAS CONSIDERED. THE POSSIBLE REQUIREMENTS OF A TRAFFIC CONTROL SYSTEM /SUCH AS RAMP METERING/ TO CONTROL CONGESTION WERE STUDIED.
126 citations
TL;DR: It is demonstrated that both safety and energy efficiency can be significantly improved for theconnected automated vehicle as well as for the neighboring human-driven vehicles and that the connected automated vehicle may bring additional societal benefits by mitigating traffic waves.
Abstract: In this paper, we present results regarding the experimental validation of connected automated vehicle design. In order for a connected automated vehicle to integrate well with human-dominated traffic, we propose a class of connected cruise control algorithms with feedback structure originated from human driving behavior. We test the connected cruise controllers using real vehicles under several driving scenarios while utilizing beyond-line-of-sight motion information obtained from neighboring human-driven vehicles via vehicle-to-everything (V2X) communication. We experimentally show that the design is robust against variations in human behavior as well as changes in the topology of the communication network. We demonstrate that both safety and energy efficiency can be significantly improved for the connected automated vehicle as well as for the neighboring human-driven vehicles and that the connected automated vehicle may bring additional societal benefits by mitigating traffic waves.
124 citations