[supermatt]

Why? Full-time professional drivers are subject to the same rules as casual drivers. They should program them not to perform traffic offenses.

[mlyle]

Because perfection probably isn't attainable. Exceeding human performance by a large margin should be good enough. There is no reason to compare a fleet driving 500,000 hours (or much more) in a year to one person driving 300 hours in a year.

A single professional driver cannot drive hundreds of thousands of hours in a year.