Along a hill road, a side drain is provided on
(A) Outer side of a spur curve
(B) Outer side of a re-entrant curve
(C) Outer side of both (a) and (b)
(D) Inner side of both (a) and (b)
(A) Outer side of a spur curve
(B) Outer side of a re-entrant curve
(C) Outer side of both (a) and (b)
(D) Inner side of both (a) and (b)