They also could introduce standards gradually by grandfathering older vehicles into the previous lack of standards, which is what NY did. Newer vehicles subject to the standards can be repaired to stay up to the minimum standard. This largely avoids the issue of impoverishment.
You can read about the 85th percentile principle here:
I actually cannot check the second since Google is blocking queries from the iCloud Private relay, but I assume it will give you a list of scholarly work on the subject. As for the autobahn, Wikipedia has some numbers from 2012:
1.74 fatalities per billion vehicle km on the autobahn versus 3.38 for US highways. There is evidence that introducing speed limits of around 80mph (130km/h, well above the speeds used drivers drive on most U.S. roads) on the autobahn would further lower it. The paradoxical situation where high speeds on the autobahn are safe and low speed limits on US highways are unsafe would be explained by the 85th percentile principle.
The GScholar link had many studies, yes. I found some conflicting opinions.
Institute of Transportation Studies, UC California [0]:
“There is, however, no empirical study that demonstrates that the 85th percentile rule optimizes safety.”
Hilda Ofori-Addo, University of Louisiana [1]:
“85th percentile speeds of vehicles are greatly affected by roadway characteristics. Therefore, roadway characteristics should be considered as equally important…”
I’ll note that this also had the lowest rate of crashes when vehicle speeds were <= 1 MPH from the 85th percentile, but there was also a confusing (to me) multi-modal distribution after that, with a 7 MPH delta having strikingly higher rate than anything else. I suspect, as the author admits, this may be due to other factors such as area type, road traffic volume, etc.
You can read about the 85th percentile principle here:
https://duckduckgo.com/?q=85th+percentile+speed
https://scholar.google.com/scholar?q=85th+percentile+speed
I actually cannot check the second since Google is blocking queries from the iCloud Private relay, but I assume it will give you a list of scholarly work on the subject. As for the autobahn, Wikipedia has some numbers from 2012:
https://en.wikipedia.org/wiki/Autobahn#Safety
1.74 fatalities per billion vehicle km on the autobahn versus 3.38 for US highways. There is evidence that introducing speed limits of around 80mph (130km/h, well above the speeds used drivers drive on most U.S. roads) on the autobahn would further lower it. The paradoxical situation where high speeds on the autobahn are safe and low speed limits on US highways are unsafe would be explained by the 85th percentile principle.