.05 Grade Requirements.

A. The gradients of intersecting streets should be as flat as possible on those sections that are to be used for storage space for stopped vehicles. Grades in excess of 2 percent may not be allowed on the landing grade (first 50 feet) of intersecting streets, unless otherwise approved by the Administration. This allows for a normal maximum grade break of 5 percent between the normal 2 percent preference road cross slope and the profile grade of the nonpreference road. Grades beyond the landing grade shall be in accordance with currently accepted engineering practices, but may not exceed 6 percent. In all cases, appropriate cross slopes provide a maximum 2 percent cross slope for pedestrian mobility in a manner acceptable to the Administration.

B. The profile grade lines and cross sections on the nonpreference intersecting streets shall be designed to provide a smooth junction and proper drainage. Normally, the grade line of the major highway should be carried through the intersection, and that of the intersecting street should be adjusted to it.

C. Commercial entrances shall be guided by the criteria in §§A and B, above. A minimum 40-foot landing grade may not exceed 3 percent. For sites smaller than 1/2 acre and low traffic generators, grades up to 6 percent are allowed. An approved grade may not exceed 6 percent, with a maximum grade break of 8 percent allowed between the State highway and the entrance profile grade.