Cruisers at KMS are also split into classes. Lain said the division doesn't require cruisier drivers to reinforce the doors unless they have been damaged in a wreck. Then, the driver either finds a replacement at a salvage yard or puts in a steel bar. Tracks have inspectors who check cars to make sure they are legal. But the safety rules are an outline only.
Drivers are free to add whatever safety features they want.
Here, you've got a Volkswagon, a Renault, or a 'K' car, or Fords, or Chevrolets or Chryslers. All they can do is make them as safe as they can. The best safety feature of all is a driver's brain. Watching the cruiser cars beat and bang will give anyone a better appreciation for drivers who can run caution-free at Talladega Superspeedway at 190 mph. The moves you make, you have to think before you do it really, and you don't want to put yourself in a situation where you might hurt somebody else or hurt yourself.