Why is there always one shoe on the side of the road?

Question

You never see a pair, just one lonely shoe on the road or highway...

Answer 1

cars run em over, so there always on the move.

Answer 2

because its only the one that falls off the roof of my car where I forgot them in the first place.

I drove 100 miles plus once and there was one shoe stuck on the bumper.  the other who knows.  Probably one of the ones you saw.

HA!