What I’ve noticed from those other systems is that a human in the loop makes the system so much more comfortable. I’ve had times where I can see the red lights ahead and the system is not yet slowing because the car immediately in front of me isn’t slowing yet. It’s unsettling when the automated system brakes at the last moment.
Because of this experience the highway has been the line in the sand for me personally. Surface streets where you’re rarely traveling more than 45 mph are far less likely to lead to catastrophic injury vs a mistake at 70 mph.
I don’t think Waymo is necessarily playing fast and loose with their tech but it will be interesting how this plays out. A few fatal accidents could be a fatal PR blow to their roll out. I’m also very curious to see how the system will handle human takeover. Stopping in the middle of a freeway is extremely dangerous. Other drivers can have a lapse in attention and getting smoked by a semi traveling 65 mph is not going to be a good day.