Figure B-100. High-severity lane/shoulder drop off.
How to Count:
The mean lane/shoulder drop off is computed by averaging the maximum and
minimum drop along the slab. Each slab exhibiting distress is measured
separately and counted as one slab with the appropriate severity level.
Name of Distress:
Linear Cracking (Longitudinal, Transverse, and Diagonal Cracks).
These cracks, which divide the slab into two or three pieces, are usually caused
by a combination of repeated traffic loading, thermal gradient curling, and
repeated moisture loading. (Slabs divided into four or more pieces are
counted as Divided Slabs.) Low-severity cracks are usually related to warp or
friction and are not considered major structural distresses. Medium or high-
severity cracks are usually working cracks and are considered major
structural distresses (fig B-101 through B-106).