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Transverse cracking <br />A crack at approximately right angles to the center line is a transverse crack. Often regularly spaced. <br />Caused by movement due to temperature changes and shrinkage of the asphalt with aging. <br />Transverse cracks will initially be widely spaced (over 50'). Additional cracking will occur with aging until <br />they are closely spaced (within several feet). These usually begin as hairline or very narrow cracks; with <br />aging they widen. If not properly sealed and maintained, secondary or multiple cracks develop parallel to <br />the initial crack. The crack edges can further deteriorate by ravelling and eroding the adjacent pavement. <br />Prevent water intrusion and damage by sealing cracks which are more than 1/4 inch wide. <br />Crack <br />frequency <br />Left: cracks isolated or <br />widely spaced <br />Right: cracks (sealed), <br />a few feet apart <br />Crack <br />width <br />Left: tight cracks — <br />hairline to 1/4" <br />Right: open crack - <br />1/2" or more <br />Page 42 <br />Deterioration <br />Left: water <br />entering unsealed <br />crack softens <br />pavement causing <br />secondary cracks <br />Right: pavement <br />ravels and erodes <br />along open crack <br />