I never though of it before, because if it does affect distance, it would be compensated for.
Otherwise all our time/distance measurements and ratings would be up the creek and meaningless.

I think the distance is measured inside from a fixed point, like, I'm only guessing, 20 feet from the outside fence or at the midpoint of the track, so in theory at least, it should not affect the race distance.

However, to make sure, I asked for clarification from the racing authorities.

When and IF I get a reply I let you know.

Cheers