Superelevation Rate for a Highway Curve
Mediumhorizontal curvessuperelevation
Using e + f = V2/(127R), with speed V = 80 km/h, curve radius R = 400 m, and side-friction factor f = 0.10, what superelevation rate e is required as a decimal?
- A0.013
- B0.026
- C0.10
- D0.126
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Answer: B. 0.026
e = V²/(127R) − f = 80²/(127 × 400) − 0.10 = 0.125984 − 0.10 = 0.025984 ≈ 0.026, or 2.6%.
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