// multi-utility computation suite · offline · instant · precise
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eng.highway-alignment-curve Calculator
Calculates horizontal highway curve parameters — radius, tangent length, external distance, and degree of curvature — from the deflection angle and design speed. AASHTO minimum radii balance driver comfort, safety, and superelevation — sharper curves require more superelevation up to the maximum of 8–10%.
Inputs
R M
Distance from centre to edge of a circle. Radius = diameter / 2.
V Km Hr
Rate of movement. 1 m/s = 3.6 km/h = 2.237 mph.
E Max Pct
Reference formula or conversion factor shown for context.
Results
required superelevation e
The value at the specified point or condition.
minimum superelevation runoff length L (m)
The smallest value in the dataset or feasible range.
side friction factor f
A dimensionless multiplier applied in the calculation.
V²/(gR) = e + f
Reference formula or conversion factor shown for context.
design adequate?
Whether the computed capacity, strength, or resource meets the minimum requirement.