The maximum safe design speed on a horizontal highway curve without considering side friction depends on superelevation ‘e’ and curve radius ‘R’ as:
Av = sqrt(g * R * e)
Bv = g * R * e
Cv = sqrt(g * R / e)
Dv = g * R / e
Explanation
When side friction f = 0, e = v^2 / (g*R), which gives v = sqrt(e * g * R).

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