Question

For sight distance calculation time of perception and reaction depends on

Answer 1

                         For a sight distance calculation, the time of perfection and reaction purely depends on the driver's ability. Sight distance is the length of the road surface, a driver can see with an acceptable level of clarity. It plays a significant role in designing highways as it builds an acceptable design speed, based on drivers ability to visually identify and stop from a particular moving vehicle without being in conflict with the opposite direction.  

Answer 2

Answer:

For sight distance calculation time of perception and reaction depends on alertness of the driver.