Check out this closed-circuit video of an intersection where a truck is trying to make a sharp turn. We say "trying" because it doesn't make it, and it nearly takes out an impatient scooter-rider who was way out front. Scooter Danger! Scooter Danger!
Remember playground merry-go-rounds? The ones where you and your friends would grab hold of the sides, run as fast as you could, then stick out your legs and fly? (Which is what made them the kind of huge insurance risks that probably banished them from public parks.)