system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why did the NASCAR road race in Indianapolis have 3 stages and how do you have overtime in a race? Did two cars finish at the same time?
gpt
Nascar implemented the stage system a few years ago to award points to drivers that had run the race well for 199 laps and then wrecked on the 200th.  A lot of endurance racing series also award points at intervals to reward *consistency* and not just dumb luck at the end.

Nascar coupled the stages with their traditional yellow flag re-start system to stack up the field and make sure the leaders don’t build too much of a gap.  Whether that’s good or bad has been controversial.

They’ve also implemented a “overtime” procedure to run an additional two laps (time and weather permitting) if a race is set to finish under a yellow flag.  Since laps on ovals can be quite short and every wreck requires a full course yellow to clear, you can easily click off 5+ laps under even a short yellow and a lot of races were finishing behind a safety car.  Anticlimactic.  The overtime system adds two laps after the green flag to get a green flag finish.  You can do this repeatedly if the field continues to crash on the restart lap.