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Related Experiment Videos

Driver behaviour during flashing green before amber: a comparative study.

H Köll1, M Bader, K W Axhausen

  • 1Ingenieurbüro Köll, Lus 88, A-6103 Reith bei Seefeld, Austria.

Accident; Analysis and Prevention
|December 4, 2003
PubMed
Summary
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Drivers often stop earlier when a flashing green light precedes the amber signal phase, as they misjudge the remaining time. This behavior, impacting traffic flow, is influenced by speed and proximity to the stop line.

Area of Science:

  • Traffic Engineering
  • Transportation Psychology
  • Road Safety

Background:

  • Understanding driver behavior at traffic signals is crucial for traffic flow optimization.
  • Traditional signal timings may not account for nuanced driver reactions to pre-amber signals.
  • Previous research has explored factors influencing stopping decisions, but the impact of flashing green requires further investigation.

Purpose of the Study:

  • To investigate the effect of a flashing green signal phase on driver stopping behavior.
  • To quantify the influence of flashing green signals on early stops before the amber phase.
  • To develop models predicting driver stopping behavior based on signal type and traffic conditions.

Main Methods:

  • Extensive video recording of traffic signal cycles at 10 locations across Switzerland, Austria, and Germany.

Related Experiment Videos

  • Analysis of approximately 5000 signal cycles using an image-processing system.
  • Estimation of discrete choice models to represent driver stopping behavior.

    • Main Results:

    • The introduction of a flashing green signal phase significantly increased the number of early stops.
    • Drivers demonstrated a tendency to underestimate the time remaining until the end of the amber phase when a flashing green was present.
    • Key factors explaining stopping behavior include vehicle speed, distance to the stop line, and their interaction (potential time to stop line).

    Conclusions:

    • Flashing green signal phases can lead to more frequent early stops, potentially disrupting traffic flow.
    • Driver underestimation of the amber phase duration is a key reason for early stops with flashing green signals.
    • Developed discrete choice models can be integrated into traffic microsimulation models to better represent real-world driver behavior.