Psychological extra widening depends on the number of traffic lanes.

Mechanical extra widening depends on the speed of vehicle.

Psychological extra widening depends on the length of wheel base.

Psychological extra widening depends on the speed of vehicle.

equally on inner and outer sides of the curve

fully on the inner side of the curve

fully on the outer side of the curve

one-fourth on inner side and three-fourth on outer side of the curve

spiral

lemniscate

cubic parabola

any of the above

based on allowable rate of change of centrifugal acceleration

based on rate of change of superele-vation

higher of [a] and [b]

smaller of [a] and [b]

ruling gradient

limiting gradient

exceptional gradient

minimum gradient