A number of year ago, a guy got a grant (something like $20,000) to investigate "Why children fall off of tricycles" (the old type of tricycle)

He concluded that 'Tricycles have too high a high center of gravity and don't turn easily. ...and children tend to be careless and ride too fast and lack coordination'

soon thereafter, the little low, plastic tricycles appeared. I'd have explained it for $500.