Pedal cars, thats a different twist on the "first car", you captured the focus of three and two year olds. I like it. Just a thought, I am wondering if a bit more description of the street context in the verses (street noises, Mr./Mrs. ____'s house or their car maybe a parked one that you were "passing", flat/hill, paved/brick/gravel/dirt road, etc.) would help paint the picture, if your intention is a suprise ending more description on the pedal cars themselves would give it away before the "twist".