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

For the design speed, v₀ = √(rg tanθ). If v < v₀, the vehicle has a tendency to slide down the bank. Static friction opposes this tendency and therefore acts up the slope.