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Driver's decision process on termination of the green light
Accident; Analysis and Prevention
|October 1, 1985
Summary
A flashing green traffic signal phase, intended to improve driver decisions, actually increases collisions. This traffic signal change leads to more inappropriate stops and a higher risk of rear-end crashes.
Area of Science:
- Traffic engineering
- Road safety
- Human factors in transportation
Background:
- A flashing green phase preceding the amber light in traffic signals is used in some countries, including Israel.
- This signal phase was intended to provide drivers with advanced warning for better stop-or-go decisions.
- However, accident data indicates an increase in traffic collisions after its implementation.
Purpose of the Study:
- To evaluate the effectiveness of the flashing green traffic signal phase.
- To investigate the reasons behind the observed increase in collisions.
- To compare driver behavior under flashing green and standard traffic signal conditions.
Main Methods:
- Analysis of accident data following the introduction of flashing green signals.
- Laboratory simulation study to observe driver responses to different signal phases.
- Comparison of stopping and crossing decisions between flashing green and regular signal programs.
Main Results:
- Accident analysis revealed a rise in collisions associated with the flashing green phase.
- Simulation results showed earlier decision responses from drivers under flashing green.
- Inappropriate stopping decisions, especially near intersections, increased significantly.
Conclusions:
- The flashing green traffic signal phase leads to a higher likelihood of front-rear collisions.
- The signal pattern creates more conflict between stopping and non-stopping vehicles.
- The intended benefit of improved driver decision-making is not realized; instead, safety is compromised.
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