Road accident will not happen if AVAS is ON

Why do most accidents happen? 
People switch their attention from the road to some other moments: they are involved in the phone, they look around, lost in thoughts. And sometimes only mechanisms familiar to the psyche can help to respond in time. It is precisely these issues that psychoacoustics deals with, and the work of the Acoustic Vehicle Alerting System (AVAS) is built according to such rules. 

Mechanisms familiar to a person for reading the all movements - approach, braking - of the vehicle will help to notice it in time. Which is very important for silent electric (non-motor) vehicles.