We are conducting the safety analysis at several uncontrolled intersections where no traffic control devices are present. We want to compare Post Encroachment Time (PET) and critical gap time for the safe stop. For those who are not familiar with the term PET, here is the definition:
The time between the first road user leaving the common spatial zone (in a two road user encounter) and the second road user arriving at it.
It is possible to determine the PET manually from the recorded video. But, my question is how to come up with the critical gap required for a safe stop based on running speed.
Thanks in advance.
Thanks a lot Prof. Kolita Weerasekera. I will go through these papers.
From a practical driving point of view, how relevant is the "2 second" rule plus one second for each of added environmental hazards (darkness, rain, poor road surface etc)? Then work backwards from time and speed to give separation distance?
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