One pebble or crack in the pavement and you're down. Much worse, a kid steps off the curb in front of you and you've got effectively no brakes.
This isn't like the introduction of cars, where people weren't used to judging speed. We now teach our kids to look both ways, and we learn to judge how fast they're coming and when it's safe to step in front of them. These things are up against laws of physics: They're so top-heavy you can't brake or turn aggressively without going down.
They can't share space with cars because the roads aren't smooth enough, and they can't share space with pedestrians because they can't maneuver.
This isn't like the introduction of cars, where people weren't used to judging speed. We now teach our kids to look both ways, and we learn to judge how fast they're coming and when it's safe to step in front of them. These things are up against laws of physics: They're so top-heavy you can't brake or turn aggressively without going down.
They can't share space with cars because the roads aren't smooth enough, and they can't share space with pedestrians because they can't maneuver.