Profiles and Elevations. Breakpoints at the beginning and end of the superelevation
transition should be rounded to obtain a smooth profile. One suggestion is to use a
“vertical curve” on the edge of the pavement profile with a length in feet equal to the
design speed in mi/h (i.e., 45 ft for 45 mi/h). The final construction plans should
have the superelevation tables or pavement details showing the proposed elevations at
the centerline, pavement edges, and, if applicable, lane lines or other breaks in the cross
slopes. Pavement or lane widths should be included where these widths are in transition.
Pavement edge profiles should be plotted to an exaggerated vertical profile within
the limits of the superelevation transitions to check calculations and to determine the
location of drainage basins. Adjustments should be made to obtain smooth profiles.
Special care should be taken in determining edge elevations in a transition area when
the profile grade is on a vertical curve.