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My reputation is to low to comment but that looks like frost heave to me, does this area experience freezing temperatures? If it is frost-heave the answer is generally proper drainage and replacing the susceptible materials under the pavement. EDIT: As suggested by Phil Sweet this could also be blistering. There are several types of blistering and the ...


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Antivehicular ones. But also anti pedestrian, The goal is to keep pedestrians and people, bikers, etc off this section. Namely because if it should be in proximity to moving vehicles.


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