Determine the distance required to transition pavement cross-slope from a normal crown section with a normal crown cross-slope of 2% to superelevation of 6% on a two-lane highway with a design speed of 50 mi/h.
What will be an ideal response?
First, determine the length of superelevation runoff required to transition from a
cross-slope of zero on the outside lane to full superelevation, using Table 15.11.
Lr = 144 ft
Next, determine the tangent runout required using Equation 15.40,
Then, the determine superelevation transition length required by summing the
superelevation runoff and tangent runout.
Required transition = 144 + 48 = 192 ft.
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