In rainy and hilly places, doesn't water flow under the roads from the sides, making little caverns beneath the pavement that collapse? In hot climates, doesn't heating and cooling from the sun create the cracks. In cold climates, doesn't expansion of ice as it freezes create the cracks?

Back 35 or 40 years ago, Phillips petroleum was promoting a paving material that supposedly solved this problem. Where is it?

There may be single causes, we just need them all to marry single solutions.