TM 5-623
M-The difference in elevation is over 2 to 4 inches (fig B-35).
Figure B-35. Medium-severity lane/shoulder drop off.
Figure B-34. Low-severity lane/shoulder drop off.
H-The difference in elevation is greater than 4 inches (figs B-36 and B-37).
Figure B-37. High-severity lane/shoulder drop off
Figure B-36. High-severity lane/shoulder drop off.
How to Measure:
Lane/shoulder drop off is measured in linear feet.
Name of Distress:
Longitudinal and Transverse Cracking (Non-PCC Slab Joint Reflective).
Description:
Longitudinal cracks are parallel to the pavement's centerline or laydown direction.
They may be caused by-
1. A poorly constructed paving lane joint.
2. Shrinkage of the AC surface due to low temperatures or hardening of the asphalt
and/or daily temperature cycling.
3. A reflective crack caused by cracking beneath the surface course, including
cracks in PCC slabs (but not PCC joints).
Transverse cracks extend across the pavement at approximately right angles to the
pavement centerline or direction of laydown. These may be caused by conditions
2 and 3 above. These types of cracks are not usually load-associated.
Severity Levels:
L-One of the following conditions exists (see fig B-38):
B-14
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