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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Depends. 2 types
1 resurfacing. You need to grind the road and then pave it. So crew 1 has the grinding machine. Crew 2 has the paving equipment. The wait is the time between when Crew 1 gets done and when Crew 2 is free. PLUS any weather delays.
2. Repair. Dig a hole. For example a culvert or pipe replacement. Now you fill in the hope, but the fill isn’t compacted. So you let people drive over it for a week. Fill compacts. You add more gravel. Then you let people drive over it for another week. Add more gravel. Let people drive over it again.
Eventually the gravel is compacted and the paving crew is free. If you just paved it the fill would shift and the road would break up.
Dirt work takes a long time to settle and if it’s rushed the road will fail.
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