Napoleon's daughters... (For anyone that doesn't know Napoleon called the artillery as "belles filles" beautiful daughters, since ya know, we has artillery guy)
The lines separating the rules are arrows pointing to the center. Additionally, if you flip the gamma the other way you can see all the letters have colors, except a few, reading "reverse key"
If you're not familiar with Dirt Late Models (they're pretty much an American-exclusive thing and mostly raced at a regional level), these lopsided racers are purpose designed for dirt ovals - the lopsidedness is for aerodynamics because they drift the ENTIRE corner when they turn. Here's a photo of a real one:
If you can't imagine these things racing, here's a highlight reel of a late model race and a 3D x-ray render of how they work.