[Smokin' Joe]

Deer, dogs, cattle, moose (yes, even moose). Too many unpredictable events occur even without other drivers, and that assumes that all else works as it is supposed to. That makes no allowances for snow, ice, blizzard conditions (well known around here), subzero temperatures, or a host of other natural and unpredictable events.

Even programming in construction detours would be a challenge.

While a lot of drivers out there are pretty scary behind the wheel, they retain the potential to react appropriately in sudden situations despite ordinary inattentiveness or poor skills.

A computer might not be able to do so, especially if it is installing one of bazillions of updates and security patches, etc.

Of course, compromise such a system with evil intent, and the potential for carnage is phenomenal, not to mention the potential for the 'removal' of individuals, while blaming a 'computer glitch'.

It'd make a great sci-fi plot, but I can't honestly say I see where it would be an improvement.

[rbg81]

You are right. There are a myriad of unique situations which a human can [usually] handle, but a computer will not be able to. Eventually, they might get the software right for 99.9% of those, but that pesky 0.1% will be enough to generate tons of horror stories. That and the inevitable lawsuits will ruin a lot of these companies early on. Software products typically have NO warranty. They will not be able to get away with that for software that controls driverless cars.