Time To Accident (TA)
Time To Accident (TA)
time to accident (ta)
TA is the time that remains to an accident from the moment that one of the road users starts an evasive action, if they had continued with unchanged speed and directions
Source:
It's used to determine the scale of conflict.
The desired TA is 1.5s in urban areas or serious conflict, and lower than 1.5 for rural areas where speed is higher.