roadway prism definition
roadway prism means that portion of the highway right-of-way between the top of cut or toe of fill [BOTTOMS OF THE DITCHES] on either side of the roadway;
roadway prism means that portion of the right-of-way between the back of ditch (at the elevation of the adjoining roadway shoulder) or the back of sidewalk and including the roadway ditches, traveled way, shoulders and auxiliary lanes.
roadway prism means the three-dimensional area of a roadway from the top of slope to the toe of slope that has been previously disturbed by roadway construction and as depicted in Figure 1. This also includes bridges, drainage culverts, walls, ditches, road surfaces, road shoulders, and road fills.