I've scrapped the old layout entirely and built a new one with mirrored symmetry. The gameplay may be a little rough, I think some parts may be too small, but it should be less confusing than the old one.
Built a new layout from scratch
Added signals to show what spawn door is
ideal for each cart
Increased the time before cart rolls back
Removed additional controlpoints
Added points and rollback to the track (in a4)
Added a card explode sequence (in a4)
Fixed the crash issues for good (wasn't easy)
Fixed bugs involving the cart not stopping
Added a new building to upper mid
Added textures and various other improvements
Joined the cult of the skinny pines.