As per IRC recommendation, the maximum limit of super - elevation for mixed traffic in plain terrain is

Concept:

IRC has fixed the maximum limit of superelevation in plain and rolling terrains and in snow-bound areas as 7.0% or 0.07 ( 1 in 15) taking such mixed traffic into consideration. On hilly roads not bound by snow, a maximum superelevation of up to 10% has been recommended. On urban road stretches with frequent intersections, it may be necessary to limit the maximum superelevation to 4.0 percent, keeping in view the convenience in construction and that of turning movements of vehicles.

Additional Information

Superelevation:

Superelevation is the transverse slope provided to counteract the effect of centrifugal force and reduce the tendency of vehicles to overturn and to skid laterally outwards by raising the pavement's outer edge with respect to the inner edge. It is represented by e.

\(e+f={v^2\over gR}\)

Where v = Speed of the vehicle,

R = Radius of the horizontal curve,

f = Lateral friction,

g = Acceleration due to gravity.