That would be the other end of the scale I guess, being ultra-careful. But in the US at least, we let teenagers drive after maybe a few hours practice. They ma

That would be the other end of the scale I guess, being ultra-careful. But in the US at least, we let teenagers drive after maybe a few hours practice. They make mistakes all the time, and we tolerate them. So our comfort zone is somewhere in between. Perhaps a 'UA Listing' that has a standard for performance in certain scenarios.