While I was not actively racing in 2008-2009 (I raced actively from 1975- early1997), then back again in 2023-).
I was actively watching that 2.5 decades, and remember when it went into effect and read, watched everything I could fully expected to return to the sport I love. Here is the article from 2009 explaining the changes.
https://competitionplus.com/featured...s-tree-routine
I made a mistake above, 3 different variations of the code are actually (Pro's, Pro Stock, and all the rest of us Sportsman), and each has minor reasonable slight timing differences, and all once the 3rd bulb actually activates the tree are slightly variable, to keep the guessing game to a minimum emulates human involvement (within reasonable tiny increments, without actually having a human involved beyond throwing the switch to arm the system to :ON!! Then no timers start till both pre-staged, then boom 1 driver will trigger it by lighting bulb 3. (Compter and last driver in hybrid control, but time is running to foul countdown), The Ghost of world famous Buster Couch RIP, is telling you get your butt in, stage already! Quit playing staging games.