But where does pista come from? The Latin pistus (“to pound” — think of the motion of pounding something into dust as being a bit like the running around the track! Pounding the pavement!). From this Latin pistus, we get a few English words including… pizza (via Italian, of course! Think of the pounding needed to make the pizza dough!) and piston (the piston engine going in circles is a bit like running as well!).
Thus, we can see the p-st of autopista maps to the p-zz of pizza and the p-st of piston.