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Reflective cracking <br />Cracks in overlays reflecting the crack pattern in the pavement underneath. Difficult to prevent and correct. <br />Thick overlays or reconstruction is usually required. <br />Concrete joints <br />reflected through <br />bituminous <br />overlay <br />Slippage cracking <br />Crescent or rounded cracks in the direction of traffic, caused by slippage between an overlay and an <br />underlaying pavement. Repair by removing the top surface and resurfacing using a tack coat. <br />prAiror;.;1r, <br />Left: crescent shaped <br />cracks characteristic of <br />slippage <br />Right: Toss of bond <br />between pavement layers <br />allows traffic to break loose <br />pieces of surface <br />Page 43 <br />