IIRC, it was Elon Musk that said something along the lines of it's not too difficult to get self-driving cars to 99.9% safety - but that's still 1 accident in e

IIRC, it was Elon Musk that said something along the lines of it's not too difficult to get self-driving cars to 99.9% safety - but that's still 1 accident in every 1000, which is terrible all around. You need to shoot for many, many 9's before it can be considered a practical alternative.