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Block cracking <br />Interconnected cracks forming large blocks. Cracks usually intersect at nearly right angles. Blocks may <br />range from one foot to approximately ten or more feet across. The closer spacing indicates more <br />advanced aging caused by shrinking and hardening of the asphalt with age. Can be accelerated by frost <br />action and heavy traffic. Repair with sealcoating during early stages to reduce weathering of the asphalt. <br />Overlay or reconstruction required in the advanced stages. <br />Large blocks <br />Approximately <br />10 feet across <br />Intermediate - <br />size blocks <br />1 -5 feet across <br />Left: shows <br />rectangular patterns <br />Right: shows <br />irregular pattern <br />Small blocks <br />Approximately one <br />foot across with <br />typical rectangular <br />shape <br />Page 45 <br />