Summer's highest case of kid accidents that ended in hospital in my country were the escooters, parents just buy whatever looks good in ad, not caring to train kid (technically moped license is needed) or even get one that's actually legal (with speed limit).

End result - machine capable of going 50km/h or faster (think they caught one doing 90) in hands of young teen or outright kid. Hell, there was even a trucker that reported getting overtaken by one...

I also hear lots of scooter accidents, and that is way too fast. The overwhelming number of deaths is still cars.