[sien]

Sober, rested, humans are great drivers.

The problem is that we also a bit too good at creating outlier situations (stoned, drunk, exhausted, angry at X Y or Z).

[astura]

Some just aren't good drivers when sober and rested - I've met many, and they let anyone with a pulse get a driver's license and even if you don't have one you're free to operate a motor vehicle all you want, nobody stops you from turning the key.

[TeMPOraL]

Sober, rested, focused humans.

We're also bad at maintaining constant focus for longer periods of time.