The other thing is that Europe doesn't have nearly as many huge SUVs as America. Helps a ton with visibility, driver awareness, braking speed, and less momentum in collisions.
Oh yes, those huge things (trucks, too) with dark tinted windows are the pox on wheels. On a motorbike you sit higher and can look over regular passenger cars, and you can see all the road in front of you. But if you ride behind one of these antisocial fuck-you-I've-got-mine hulks you can't see the road, and it's life-threatening.
https://www.npr.org/sections/thetwo-way/2018/05/14/611116451...
My 2016 VW Golf was very difficult to see out of, and that's a small(ish) box on wheels! I barely even bothered to look out of the mail slit rear window, I just use the backup camera.
Our Tesla 3 is even worse; the rear 3/4 view is virtually impossible, and the trunklid is so high you'll only see the roof of the car behind you. Again, you're far safer relying on the camera at that point. The car also has huge blind spots due to the insane US side mirror laws that require flat glass on the driver's side. I'm anxiously awaiting the 3 going on sale in Europe so I can buy an aspheric replacement that allows me to see more than the grille of the car on my left.
In other parts of Europe, road traffic is often much faster that speed limits (Central and Southern Europe) and drivers are not cooperative at all. Yeah, nothing that separated bike roads wouldn't solve.