On Sunday at Detroit, the IndyCar Series found out how dreadful a two-hour delay to patch potholes can be.
The race was run on the street course on Belle Isle, and like many city streets and even older tracks, parts of the surface had been sealed or patched because of wear. And because of the high speeds and downforce generated by the the cars, small bits of the surface and sealant were being dislocated from the track throughout the race.
As the race progressed, mirrors, front wings, (and even helmets, in the case of Tony Kanaan), bore the signs of the flying debris. And then, so did the cars of James Hinchcliffe and Takuma Sato.