Propane powered cars were (are) on public roads, for better or worse.
1. In countries where that is popular, due to unfortunate events, they are not allowed in many indoor parking lots.
2. Does anyone have a comparison of pressures and volumes between a car's propane tank, and the Roadster's COPV?
3. The converted car propane tank does not have exhaust ports in various directions that could shred meat, whenever the driver chooses.
For 2: my basic research shows that Roadster's COPV has 50x to 100x the pressure.