A banked road is designed for speed v₀ such that no friction is required. If a vehicle moves with speed v > v₀, the static friction on the tyres acts:
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A banked road is designed for speed v₀ such that no friction is required. If a vehicle moves with speed v > v₀, the static friction on the tyres acts:

G1 Physics · Accepted Answer

If v > v₀, the required inward centripetal force is greater than that provided by the horizontal component of the normal reaction alone. The vehicle tends to move outward/up the bank. Static friction therefore acts down the slope, contributing an additional inward component.