> Arguably, all RTCs are the result of inadequate attention from someone or other. But attentive, well-trained drivers have collisions too. Perhaps their attention lapsed? They're human - human attention wanders, they're not focused 24/7 on the task, because they're not machines.

I'd say most of them. It's possible to be driving along with a clear road ahead and have a person or object suddenly appear in front of you. I recall a case where a child was riding a bike on the pavement (sidewalk in the U.S.?) and for some reason lost control and fell into the road. The driver had been adhering to the speed limits and was paying attention but unfortunately was unable to stop in time and the child ended up dying.

There's lots of edge cases with driving which is why there's a bunch of recommendations regarding speed and leaving space so that when something unexpected happens, there's more chance for a careful driver to be able to stop or avoid the incident.

And yes, I totally agree about too many cars.