They're too fast. and people can't stop in time.
We have the "road" for cars with very specific rules to make driving predictable.
Absent those rules, among pedestrians, an unruly set of curvatures and grades, Human reaction time will invariably fail.
It's then only a matter of statistics, HOW OFTEN.
this is kinda true but not really. it's like competitive gaming. how do pro players queue with a bunch of ****ters on smurf accounts and still manage to get a brand new account to top rank in a day or two? there's a lot more going on than raw reaction time i'd say. the best road users are really good at two things: 1. avoiding dangerous situations 2. being able to navigate dangerous situations. most have one or neither of those skills, but if you have both, its a magical skill, because you're not just covering for yourself, you are able to cover the shortcomings of those around you, just like pro gamers. it's less of a reaction time thing for sure. there's a lot of public map data on pedestrian and accidents involving non-car bikes, scooters, skateboards etc. you'll notice it's a pretty obvious heatmap. understanding this is the same as having 'game sense' in shooters, basically knowing parts of maps where a fight usually happens etc. kinda interseting i guess?