Like I said earlier about horse racing, it's not a matter of a riderless horse having less weight, it's simply in the rules that a jockey has to be aboard a horse as it crosses the finish line in order for the effort to officially count, although jockeys DO have to weigh in before AND AFTER a race (with saddle) in order to prove they didn't 'shed' any weight during the race.
In any case, I wondered if the rules would be similar with NASCAR regarding a driver being in the car as it crossed the finish line. I'd bet my right arm that it is.
I’m still fuzzy on it - the only way i can see a driver-less NASCAR vehicle crossing the finish line w/o the driver is if a yards-away accident happened - and i can picture the team/driver/car being declared the winner if it occurred so the vehicle crossed first since the odds of it not inning w/o the accident would be pretty low...but not impossible....might have to see if NACSAR has rules on the subject.