Technically yes but on any given track day there can still be gravel, weeds, rubber, bits of material from car body kits/aero, and even various liquids that have leaked.
Every track day I've attended required the cars to have been inspected for leaks and loose components. And they were quick to clean up any debris or oil.
Not that tracking cars is the safest hobby, but if someone is gonna drive like that regardless its far safer at a track than on public roads.