Basically, if it’s raining, and you drive through dirt, it will leave tracks there for a long time, if you drive in fort after its rained, then drive on the road, there will be mid tracks for a while, if you drive in sand, the tracks will stay for a short while then slowly disappear.
I think if you drive thru tracks repeatedly they should eventually become permanent, or every time you drive over tracks, the track-go-away-timer resets