They didn't link to either of their sources, so I went and found them: Mountain View Police Department blog post: http://mountainviewpoliceblog.com/2015/11/12/inquiring-minds... Google Self-Driving Car Project Google+ post: https://plus.google.com/+SelfDrivingCar/posts/j9ouVZSZnRf
It's absurd that 24 mph in a 35 zone is considered "too slow". This is nearly equivalent to driving 40 km/h in a 60 km/h zone, and there is not a single traffic court in any Canadian city that would uphold a ticket being served for that difference. How is this even a thing down there? In a 60 km/h zone here, you'd have to be going 25 km/h to even warrant being pulled over at all (ie: doing 15 mph in 37 mph zone). If…
It's absolutely too slow.
Majority of people drive at or slightly below the speed limit. Driving that far under causes people to start behaving irrationally resulting in lots of lane changes/tailgaiting etc. This can be dangerous when lots of cars are doing it.