A horizontal curve is to be designed for a section of a highway having a design speed of 50 mi/h. (a) If the physical conditions restrict the radius of the curve to 400 ft, what value is required for the superelevation at this curve? (b) Is this a good design?

What will be an ideal response?


(a) Determine required superelevation
First, determine the coefficient of side friction, fs, from Table 3.3.
fs = 0.14
Next, use equation 3.34 and solve for the superelevation value.
R = u2 / 15(e + fs)
e = [u2 / 15R] – fs
e = [(50)2 / 15(400)] – 0.14
e = 0.28
(b) Is this a good design?
The superelevation for this curve would be 0.28. Since e = 0.28 > 0.10 (allowable maximum superelevation, this would NOT be a good design.

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