My friend was killed, driving his car on the street. It had an 8.50 cage, and had a "helmet" bar . He got T boned making a turn and hit his head on the bar. He died a few days after the accident in the hospital.
Please if you have a cage, make sure it has padding , and even better wear a bicycle helmet at the minimum when riding in the car on the street. ANY accident with no helmet will be very bad.
ANY one riding in the back seat of a car with a roll cage/bar will definitely get hurt without head protection. Keep that in mind please