If you want a full field, you can always run NR2003 on the Sierra
server and join in a super speedway (restrictor plate) race. 300
to 500 players online depending on the time and day of week, and
several 35+ player races. The main reason it's so popular is
little racing skill is required. The only time you lift on the
throttle is to avoid rear-ending the car in front of you while
drafting. So the skills you learn are wreck avoidance, pitting
well, and getting lucky enough to get right back into a draft
after exiting the pits. Although all the cars are the same,
for wreck avoidance I recommend a "Dodge".