Bolt in cage?

sounds like the rulebook is saying a unibody car is not safe with a roll bar welded to sheetmetal. my insurance company for the street said no rollbar - I said jeeps have rollbars! and mine is well padded. Is there any data that on the street with a padded bar and a 5 point harness and no helmet no rollbar is safer. I have seen some bad street car crashes and said looks like they may have lived with a rollbar and seatbelts
The NHRA rule book says welded to the plates that are bolted to the floor. The plates spread the load around the sheet metal.
A harness on the street can cause a neck injury. It was recently brought to my attention that the purpose of airbags is to prevent neck injury. The reason that racers are using the HANS device is that the drawback to a harness in a frontal collision in a car without airbags is neck injury. Helmets, rollbars,and harnesses have no place in a street car. IMHO.