Highlights ► Lane-changing maneuvers are predominantly responsible for oscillation formations in the absence of other exogenous factors. ► Regardless of the trigger, the features of oscillation propagations are similar in terms of speed, duration and amplitude. ► Lane-changing maneuvers are primarily responsible for transitions from pre-cursor to well-developed phases. ► An oscillation has a regressive effect on car-following behavior: a timid (aggressive) driver becomes less timid (aggressive). ► An extended framework of Newell’s car-following model is able to describe the regressive effect with reasonable accuracy.
Abstract 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 (CF) behavior. 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 (characterized by larger response time and/or 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 model is able to describe the regressive effect with two additional parameters with reasonable accuracy, as verified using vehicle trajectory data.
Freeway traffic oscillations: Microscopic analysis of formations and propagations using Wavelet Transform
Transportation Research Part B: Methodological ; 45 , 9 ; 1378-1388
2011-01-01
11 pages
Article (Journal)
Electronic Resource
English
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