Aut cum scuto aut in scuto
My father attended a Memorial day race back in the early 1930s when the "Brick Yard" was still mostly brick. He was a big race fan and growing up in Paterson, NJ regularly attend the midget races in Hinchliffe stadium. Anyone interested can read this:https://en.wikipedia.org/wiki/Hinchliffe_Stadium
A lot of speed has flashed along, over that core.
Why no concrete ? Sorry, not a race connoisseur.