Which one of the statements is/are correct?
1
An ascending gradient of 1 in 100 meets an ascending gradient of 1 in 120 to form a valley curve.
2
A falling gradient of 1 in 75 meets a falling gradient of 1 in 50 to form a summit curve.
3
The length of summit curve is determined on the basis of head light sight distance
4
An ascending gradient of 1 in 100 meets an ascending gradient of 1 in 120 to form a summit curve.