don't ask why, but i was doing the drag tutorial on their website and on there it says, and i quote:
Reaction Time(RT) - This tells you how quickly you reacted to the green light on the Christmas Tree. You want your RT to be at or as close to .500 as possible
the NHRA changed it's policy last year, it's still a .500 full tree but the timer starts on the green not on the last yellow as in previous years to make it easier for noobs to understand.