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Patch repair is a common form of pavement maintenance.  It deals mainly with isolated areas.  The pavement is removed from these areas by saw cutting , backhoe or a grinding machine.  It is then replaced with new asphalt. 

In most cases, if base rock exists in the roadway but it failed because of too small a thickness, you should replace the base rock section to match the adjacent areas that have not failed. 

Irregular shaped patches with multiple angles create weak points and should be avoided.  Square or rectangle areas work the best for patching.