New Rule: In 2019, there will be 16-rider main events with six, five, and five riders across three rows.
Old Rule: Previously there were 18-rider main events with six riders across three rows.
CTex's Thoughts: The idea behind this rule is that 18 riders is too many on certain racetracks. For the most part, this new rule is based on safety. I am a fan of it for a couple of reasons. The first lap is often cluttered at some races and taking less riders to the main event should help with this. You could compare it to motocross or roadracing, but it's different because those guys have front brakes and track runoff. Some will complain about taking less riders to the main, but we need to stop looking at professional racing like Little League baseball. Not everyone gets to participate in the big show.