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PIEV is the complete reaction time of the driver while he is driving and calculating the braking distance.
P – Perception time: Time lost in perceiving the object.
I – Intellection time: Time lost in understanding the situation.
E – Emotion time: Time lost in fear, anger, etc.
V – Volition time: Time lost in final action i.e., applying break
Reflex action: It may not be possible for a driver to apply breaks, avoiding actions like turning by the reflex action without a normal thinking process.
Braking distance: L = V² / 2.g.b.f
here, breaking efficiency (b) is assumed as 100 %, therefore ;
L = V ² / 2.g.f