I was told once it’s because cities project the job to take say 5 weeks, so they rip it up the first week, leave it for 3 weeks, then repave the last week. And they do this so everyone gets a paycheck for the full 5 weeks. Surely there has to be a different reason?
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Sometimes there is time needed from ripping it up to paving it to inspect the underlying material for competency.
For asphalt, that may mean the owner and designer needs to decide on the cost benefit analysis to remove more asphalt be putting a layer back on top and doing a more fully rehabilitation a subsequent year vs doing it now.
Sometimes it isn’t a surprise and part of the plan, this has been true for projects I’ve been nowhere it was asphalt paved over a concrete base. They needed a speciality contractor come and do a “falling weight test” across any cracks in the concrete to determine if there was sufficient aggregate interlocking to transfer load, or if some steel cross sticking would be needed, or if the whole section of concrete needed to be replaced.
ELI5: sometimes when you unwrap a present you need to decide if you want the gift or not
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