The minimum length of a valley curve should be such that the head light beam sight distance is equal to

The minimum length of a valley curve should be such that the head ligh

1.	The minimum length of a valley curve should be such that the head light beam sight distance is equal to
A.	Stopping sight distance
B.	Passing sight distance
C.	Braking distance
D.	Chord distance
Answer» B. Passing sight distance