But I'm not sure if we can trust these studies. I'd really like to see a completely independent evaluation, of how the safety of Waymo cars compares to human drivers, and to the safety other companies like Zoox.
That said, human drivers in the US are bad. We have the highest traffic crash rate among all developed countries by far. Pedestrian and cyclist crash rates have been increasing in the US, one of the only developed countries in the world that this is happening in. Much of the US remains opposed to automated traffic enforcement or speed governors of any kind. Privacy advocates use privacy as an excuse but given how much Americans care about their privacy in other aspects of their life, I'm doubtful. And anecdotally it's common for friends to talk about driving 10-15 mph over the speed limit, and we know speed is the leading predictor for severity of a crash. Most US drivers, especially of higher income classes, are probably well aware that they speed and break plenty of other traffic laws on a regular basis and don't want to reckon with that fact.
Because 99 44/100 percent of the time, this is not a factor. The true threat is not someone going 10 over on the highway, it's the loons you see zooming ahead of everyone else going 20+ over, weaving like they're in a video game. Equally unsafe are the self-appointed speed police camping in the left lane doing 2 under (looking at you, Greater Seattle). This forces people to pass on the right to keep up the flow of traffic, which is much less predictable.
The correct answer is to keep right except to pass, keep your speed within reason (<10 over max in good weather), keep a decent following distance, and let the cops take care of anyone driving recklessly. If speed was so dangerous by itself, Germany would not have Autobahns.
According to a government study into Autobahn fatalities that occurred in 2018, "non-adapted speed" (defined as the appropriate speed for the traffic conditions and allowing full control of the vehicle) was the cause of death in 45% of cases overall. For stretches without a tempo limit it was 46%, for stretches with one it was 50% -- this may be a good statistical for the tempo limits, as presumably there would have been more deaths on those stretches without the limits having been set.
Overall, 70% of Autobahn deaths occur on the segments without a tempo limit for a variety of reasons.
Speed limits on the Autobahn are a frequently-discussed and controversial topic in Germany, but for what it's worth, they're quite actively managed for safety reasons.
Gov source (in German): https://www.destatis.de/DE/Presse/Pressemitteilungen/Zahl-de...
Our freeways stateside were largely built in the late 20th century to a uniform 70mph (~110km/h) speed limit engineering-wise. But after the 1970s oil crisis, speed limits became a political football that often have as much to do with driving traffic ticket revenue for local governments as actually promoting driving at a safe speed.
So the problem is that a portion of Americans commenting on our speed limits don't understand there's a difference between "what the government puts up on the sign" and "what is actually a safe speed to drive without endangering other people" as if what's on the sign is some sacred totem that shall not be questioned because We Must All Follow The Rules Like Good Little Boys and Girls.
Not just because it's easier to pass the time, but also because there's no push to make the experience of driving "more interesting." (Too much, and someone drives unsafely, too little, and they aren't really paying attention.)
Given how commonly understood this situation is, I wonder what fraction of the population can read a book or watch a movie while riding in a car without getting fairly sick.
Published: 18 June 2024
https://www.nature.com/articles/s41467-024-48526-4
"The analysis suggests that accidents of vehicles equipped with Advanced Driving Systems generally have a lower chance of occurring than Human-Driven Vehicles in most of the similar accident scenarios. However, accidents involving Advanced Driving Systems occur more frequently than Human-Driven Vehicle accidents under dawn/dusk or turning conditions, which is 5.25 and 1.98 times higher, respectively."
Not necessarily. Safety is not the only thing we care about, we also want to spend less time in cars.
20mph motorways would be much safer than current limits or even 50mph, but the loss of QALYs from people sitting in cars would not be worth it.