— AutoGuide.com (@AutoGuide) March 29, 2017
Asphalt starts out as a very hot goo. As it cools, it becomes hard (so we can drive on it), but also, somewhat brittle. Potholes begin as tiny cracks in the hardened surface of asphalt, due to traffic vibrations and the weight of heavy vehicles. These cracks allow water .
In this latest video from Ars Technica