Wouldn't it still be "first or worst", no matter how many cars are running? The last competitor to red-light would be the winner, unless he or she crossed the center-line or hit the wall.
Z-max isn't the first place to have "four-wide" racing, but hopefully they'll be the last. The only "good'" thing about it is that it shortens the time needed to run the professional classes and leaves more time for Sportsman!
Lew