I once had the privilege of riding around the dunes in Pismo beach in a "Dune Buggy" (water pumper) pre-VW buggy days. The roll cage was all welded with Oxy-Acetylene and coat hangers. It seemed perfectly acceptable to me that the guys had to re-weld parts of the cage every night right in the camp ground. (My standards were a little lower in the 60's).
That water pumper was a '56 Ford station wagon with the motor set back to allow a one foot drive shaft, "dual" wheels made by welding one wheel with no center onto a second wheel, both split and welded over a section of pipe to make them twice as wide, allowing the side walls to contribute to the sand traction. Oddly the roll cage seemed to be the only part that failed on a regular basis. Probably had run out of "clean" coat hangers and started using the painted ones!
It would seem my Fathers refusal to allow me access to a motorcycle did not significant reduce my exposure to risk.