Heat and the binder
Asphalt binder softens as it heats up. On a large unshaded Solano parking lot in midsummer, the surface gets hot enough that the pavement is more likely to deform under slow, heavy loads.
That leads to rutting and shoving in predictable places: entrances, drive-through lanes, loading areas and anywhere vehicles turn or brake slowly. When we know where those areas are ahead of time, we can build them stronger from the start instead of repairing them again and again.