[hrunt]

> You would expect teams to game the system and use longer splitters if photo finishes happen often enough. Tried taking a look at the regulations and it seems that they're not publicly available.

NASCAR cars are standardized and measured before and after every race. Failing a race inspection severely penalizes the team (loss of points, driver or crew chief suspensions, fines). Failing a pre-race inspection means the car doesn't race until it passes inspection. Teams aren't allowed to install splitters with different lengths than their competitors.

NASCAR, however, will mandate different splitter measurements for different racetracks. Still, all cars at each racetrack must use splitters that match NASCAR's requirements.