15 March 2001
17.1. Description. Slippage cracks are crescent- or half-moon shaped cracks having two ends
pointed away from the direction of traffic. They are produced when braking or turning wheels
cause the pavement surface to slide and deform. This usually occurs when there is a
low-strength surface mix or poor bond between the surface and next layer of pavement structure.
Deduct curve for slippage cracks is shown in Figure 17.1.
17.2. Severity Levels.
No degrees of severity are defined. It is sufficient to indicate that a slippage crack exists
(Figures 17.2. and 17.3.).
17.3. How to Measure. Slippage cracking
in square feet (square meters)
17.4. Options for Repair.
Do nothing, partial-, or full-depth patch.