Preventing Transverse Bumps and Cracks in New Asphalt Overlays over Crack Sealants

The Colorado Department of Transportation has released a report that presents results of a five-year study designed to identify factors that relate to the appearance of bumps and consequent cracks. These bumps occur when a hot mix asphalt overlay is placed on top of a pavement containing crack sealants. They can become progressively more severe upon further compaction.