NASCAR reveals new limits on Cup drivers in Xfinity and Trucks

Starting next season, drivers with more than five years of full-time experience in the Cup series will be limited to a maximum of seven races in Xfinity and five races in Trucks.

Any drivers who receive points in the Cup series will be ineligible to compete in the regular season finale and playoff races in the other championships, as well as the Dash 4 Cash races in the Xfinity Series.

"Fans have made it clear that they want to see the future stars of the sport racing against their peers in the Xfinity and Camping World Truck Series," said Jim Cassidy, NASCAR's senior vice president of racing operations.

"These guidelines achieve that and preserve limited opportunities for developing drivers to compete against the best in motorsports."

This year, NASCAR limited Cup drivers with five years of full-time experience to 10 Xfinity races and seven in Trucks in organisation's first attempt at reducing the participation of Cup drivers in lower series' events.

It had previously changed the rules in 2011 to compel drivers to only register to score points in one series to stop Cup regulars claiming the lower-tier titles too.