
Block cracks, otherwise referred to as shrinkage cracks, present themselves as linear cracks several feet apart but often at different angles.
These types of cracks often appear in older asphalt that sees a light traffic loading. They are the result of the asphalt being allowed to shrink horizontally with little stress being applied vertically as the asphalt ages.
These typically should be filled with and sealed with a hot pour crack filler material to prevent water penetration.