The impacts of flashing green at signalized intersections - case study of Břeclav

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F44994575%3A_____%2F21%3AN0000081" target="_blank" >RIV/44994575:_____/21:N0000081 - isvavai.cz</a>

Result on the web

<a href="https://yrs.sdzp.org/wp/wp-content/uploads/2021/09/YRS2021-Proceedings.pdf" target="_blank" >https://yrs.sdzp.org/wp/wp-content/uploads/2021/09/YRS2021-Proceedings.pdf</a>

DOI - Digital Object Identifier

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Result language

angličtina

Original language name

The impacts of flashing green at signalized intersections - case study of Břeclav

Original language description

The red signal violation may lead to traffic conflicts that often result in death or serious injuries at signalized intersections. Therefore, the flashing green was designed to work as a psychological measure to eliminate this violation. It works on the principle of dilemma zone reduction as it simplifies drivers’ decision to smoothly stop or safely drive through the intersection. As side effects of the flashing green introduction, the increase of premature stops and rear-end collisions were monitored in recent research. The aim of this study is to demonstrate the flashing green effect on the intersection safety and capacity. For this purpose, a pilot study of 6 consequent intersections in Břeclav was carried out. Drivers' behavior surveys were performed in two ongoing steps. During traffic conflict observation, video from a drone situated above the intersection was recorded. The results show decrease in vehicles’ speed at time of yellow onset. On the contrary, a slight increase in conflicts at the time of flashing green onset was observed. The survey shows that drivers stop earlier before yellow onset which leads to a 1,8s reduction of effective green time. Interviews with local drivers about the signal change show people´s positive attitudes towards the flashing green introduction (84%). Furthermore, results show that a quarter of respondents do not know how to correctly respond on flashing green signal, so a nationwide campaign would be needed before flashing green´s widespread introduction.

Czech name

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Czech description

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Type

O - Miscellaneous

CEP classification

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OECD FORD branch

20104 - Transport engineering

Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2021

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů