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Analyzing fluctuations in car-following

Wagner, Peter (2012) Analyzing fluctuations in car-following. Transportation Research Part B (46), pp. 1384-1392. Elsevier. DOI: 10.1016/j.trb.2012.06.007

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Official URL: http://dx.doi.org/10.1016/j.trb.2012.06.007


Many car-following models predict a stable car-following behavior with a very small fluctuation around an equilibrium value g∗ of the net headway g with zero speed-difference Δv between the following and the lead vehicle. However, it is well-known and additionally demonstrated by data in this paper, that the fluctuations are much larger than these models predict. Typically, the fluctuation in speed difference is around ±2 m/s, while the fluctuation in the net time headway T = g/v can be as big as one or even two seconds, which is as large as the mean time headway itself. By analyzing data from loop detectors as well as data from vehicle trajectories, evidence is provided that this randomness is not due to driver heterogeneity, but can be attributed to an internal stochasticity of the driver itself. A final model-based analysis supports the hypothesis, that the preferred headway of the driver is the parameter that is not kept constant but fluctuates strongly, thus causing the even macroscopically observable randomness in traffic flow.

Item URL in elib:https://elib.dlr.de/78184/
Document Type:Article
Title:Analyzing fluctuations in car-following
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Wagner, Peterpeter.wagner (at) dlr.deUNSPECIFIED
Date:22 October 2012
Journal or Publication Title:Transportation Research Part B
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
DOI :10.1016/j.trb.2012.06.007
Page Range:pp. 1384-1392
Keywords:Time headway distribution; Speed-difference distribution; Stochasticity of traffic flow; Driver heterogeneity; Microscopic modeling; Car-following
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Traffic Management (old)
DLR - Research area:Transport
DLR - Program:V VM - Verkehrsmanagement
DLR - Research theme (Project):V - Verkehrs- und Mobilitätsmanagement (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Transportation Systems > Traffic Management
Deposited By: Wagner, Dr. Peter
Deposited On:08 Nov 2012 15:24
Last Modified:12 Dec 2013 21:49

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