Question

A specification for highway superelevation transition stipulates that the edge profile transition is not to exceed a 1:200 difference from the centerline profile. A right-hand curve is being designed with full superelevation of 8% on a four-lane divided freeway. The lanes are 12ft wide, and the design speed is 70 mph. The normal slope is 1% and the superelevation is to be rotated about the median edge of the running lanes. What is most nearly the minimum length of transition for the right side of the roadway?

Answer 1