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EVALUATION —Cracks 9 <br /> Centerline crack Longitudinal cracks <br /> (still tight). <br /> ► Cracks running in the direction of traffic <br /> . - are longitudinal cracks. Center line or <br /> lane cracks are caused by inadequate <br /> .r <br /> bonding during construction or reflect <br /> -° -Edge cracking cracks in underlying pavement. Longi- <br /> -• ° • <br /> from weakened - tudinal cracks in the wheel path indicate <br /> subbase and • fatigue failure from heavy vehicle loads. <br /> traffic loads. g = . . Cracks within one foot of the edge are <br /> caused by insufficient shoulder support, <br /> poor drainage, or frost action. Cracks <br /> 1. - ' usually start as hairline or vary narrow <br /> - _ and widen and erode with age. <br /> . Without crack filling, they can ravel, <br /> develop multiple cracks, and become <br /> s °- wide enough to require patching. <br /> ze Filling and sealing cracks will reduce <br /> moisture penetration and prevent <br /> -- further subgrade weakening. Multiple <br /> r <br /> longitudinal cracks in the wheel path <br /> or pavement edge indicate a need <br /> for strengthening with an overlay or <br /> reconstruction. <br /> TAWS- <br /> First stage <br /> of wheelpath <br /> cracking caused by <br /> heavy traffic loads. <br /> Load-related cracks Multiple open <br /> in wheel path plus cracks at center <br /> centerline cracking. line,wheelpaths <br /> and lane center. <br /> a. <br /> Ilk°' <br />