The type of transition curves generally provided on hill roads, is?

In Case of Transition Curves, If Traffic Coondition Is Mixed then Provision of  Speed is Ltd. to 60% of Max.Speed of Vehicle. One side of Curve will Higher then the other side for the case of accident of Traffic.

Another 'Brainstorming' question! Thanks.

I would choose Option:

D. spiral

Spiral. The extra widening is generally provided fully on the inner side of the curve.

curves generally is Spiral

TRANSITION CURVES, IN CASE IF TRAFFIC CODITION IS MIXED THEN PROVIDE SPEED AS 75% OF MAXIMAM

The mostly used transition curve in hill roads is the Spiral

The transition  type of curves  generall provided on hill roads is spiral