You see them on sidewalks and streets across the country, electric scooters, bikes, and even trikes equipped with motors that enable them to hit speeds up to 30 miles an hour. But with no federal rules on the minimum age for riders, more and more kids are hopping on. Jamie Klein gave his son Garrett this e-trike for his 12th birthday, thinking it was safe with a max speed of 15 miles an hour.>> Do you think people looking at this realize how potentially dangerous it can be. >> No. Not until you get on it.>> ...