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Basically, they're expansion gaps evenly spaced in the roadway where a tough but pliable material (tar-based, I guess) can expand and compress with the weather conditions. They make the rhythmic double thud as first your front, then rear tires go over them at speed. The liquid tar that is used to fill in cracks as well as cold patches used on pot holes are also culprits. Infrastructure is on the out nation wide it seems.
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