&gt; <i>Would there be more or less mistakes (collisions) if people were forced to be engaged 100% of the time in order to operate the vehicle?</i><p>I think there would be less mistakes, but the problem is, you can&#x27;t sustain the required level of engagement for long. 100% concentration for 15 minutes? Sure. 30? Yes. One hour? Maybe. Three hours? Probably not.<p>Though, come to think of it, one hour would probably be enough to cover like 95% cases of commuting.