Re: Performance? Art?
Unless every single car in the city is now self-driving and navigating entirely off of Google Maps, and all heading in the same direction, this didn't "fuck up the city." It caused a few people using GM to pick alternate routes, probably mostly rideshare drivers, and confused the hell out of a few people who stayed on the road anyway.
And, you know, it's white hat hacking that points out a potential problem in a system in a relatively benign way.