Loop Interiors. In cut, the interior of a loop should be graded to form a normal ditch
section adjacent to the lower part of the loop, and the backslope should be extended to
intersect the opposite shoulder of the upper part of the loop. This applies unless the
character and the amount of material or the adjacent earthwork balances indicate that
the cost would be prohibitive. Roadside cleanup and landscaping should be provided
in undisturbed areas of loop interiors. If channels are permitted to cross the loop interior,
slopes should not be steeper than 4:1. Figure 2.25 shows an example.