Safe Speed For Horizontal Curve Calculator

This horizontal curve design speed calculator helps you to find the maximum speed that the vehicle could follow while cornering. Cornering force is the lateral force produced by the vehicle while cornering. It is also known as the side force and is a force which is exerted parallel to the road surface. This safe speed for horizontal curve calculator helps you calculate the safe speed limits for horizontal curve greater or lesser than the specified speed limits say 50 mph.

Horizontal Curve Design Speed Calculator

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Formula:

If Safe speed of Horizontal Curve greater than 50 mph Safe Speed for Horizontal curve ( V > 50mph ) = ( ( ( -0.03 × r ) + ( √ (((.03 × r) × (.03 × r)) + ((4 × r) × ((15 × (e / 100)) + 3.6))))) / 2) If Safe speed of horizontal curve less than 50 mph Safe Speed for Horizontal curve ( V < 50mph ) = ((( -.015 × rhname ) + ( √ ((( .015 × rhname ) × ( .015 × rhname )) + ((4 × rhname) × (( 15 × ( ehname / 100 )) + 2.85 ))))) / 2); Where, r = Radius of Horizontal Curve(ft) e = Superelevation

The outer side of the curves on the roads will be slightly elevated than the inner side of the curve. This is to neutralize the tendency of the center of gravity of the vehicle moving outwards the curve. This is called the superelevation. By knowing the radius and superelevation of the horizontal curve, we can calculate the speed limit using this safe speed for horizontal curve calculator.

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