Freeway traffic oscillations : microscopic analysis of formations and propagations using Wavelet Transform
Zheng, Zuduo, Ahn, Soyoung, Chen, Danjue, & Laval, Jorge (2011) Freeway traffic oscillations : microscopic analysis of formations and propagations using Wavelet Transform. Transportation Research Part B : Methodological, 45(9), pp. 1378-1388.
In this paper we identify the origins of stop-and-go (or slow-and-go) driving and measure microscopic features of their propagations by analyzing vehicle trajectories via Wavelet Transform. Based on 53 oscillation cases analyzed, we find that oscillations can be originated by either lane-changing maneuvers (LCMs) or car-following behavior (CF). LCMs were predominantly responsible for oscillation formations in the absence of considerable horizontal or vertical curves, whereas oscillations formed spontaneously near roadside work on an uphill segment. Regardless of the trigger, the features of oscillation propagations were similar in terms of propagation speed, oscillation duration, and amplitude. All observed cases initially exhibited a precursor phase, in which slow-and-go motions were localized. Some of them eventually transitioned into a well developed phase, in which oscillations propagated upstream in queue. LCMs were primarily responsible for the transition, although some transitions occurred without LCMs. Our findings also suggest that an oscillation has a regressive effect on car following behavior: a deceleration wave of an oscillation affects a timid driver (with larger response time and minimum spacing) to become less timid and an aggressive driver less aggressive, although this change may be short-lived. An extended framework of Newell’s CF is able to describe the regressive effects with two additional parameters with reasonable accuracy, as verified using vehicle trajectory data.
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|Item Type:||Journal Article|
|Keywords:||Car-following behavior, Lane-changing maneuver, Stop-and-go traffic; Traffic oscillations; Wavelet Transform|
|Subjects:||Australian and New Zealand Standard Research Classification > BUILT ENVIRONMENT AND DESIGN (120000) > URBAN AND REGIONAL PLANNING (120500) > Transport Planning (120506)|
|Divisions:||Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Past > Schools > School of Urban Development
|Copyright Owner:||Copyright 2011 Elsevier|
|Deposited On:||07 Jun 2011 22:41|
|Last Modified:||09 Oct 2012 16:46|
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