https://twitter.com/mattmcfarland/status/620571336214056960 https://twitter.com/mattmcfarland/status/620571336214056960 and related coverage at the time was whe

https://twitter.com/mattmcfarland/status/620571336214056960 https://twitter.com/mattmcfarland/status/620571336214056960 and related coverage at the time was where I came to believe these were level 4. It's fairly hard to get a specific timeline of this though. Edit: also articles like this: https://www.mercurynews.com/2015/11/13/driverless-google-car-finds-itself-in-worlds-most-viral-traffic-stop/ https://www.mercurynews.com/2015/11/13/driverless-google-car... I think it's not considered "level 4" because of specific state exemption and the speed limit.