ANS:B - centrifugal ratio

Ans is correct.
Centrifugal ratio=p/w.
P=mv^2/r and w=mg.
So. CAR=v^2/gR. For Highways centrifugal ratio (v^2/gr) = 1/4 = 0.25.
Maximum superelevation should be 1/4 for a comfortable ride.
For Railways Centrifugal ratio should be 1/8 = 0.125. I hope v2/gr formula for calculation of super elevation so need to be correct the answer.