Max limit is four drivers of the same team on the track. I agree with the limit needing to be reduced. The competitive of the drivers trying to get their bonuses and endorsements is really getting out of hand. Yeah it is G2, but still, two drivers of the same team would be enough. Formula 1 has to have that two driver rule as it is G5, with left and right turns, plus their cars go a lot faster. I still get a kick out of it when someone says Nascar is more skill than Formula 1, it would be true if it was all about engineering.