My five-year-old pre-K tot has started riding his own bike while I ride mine. He is years from riding unaccompanied, but I want to improve his judgment, if you know what I mean. My not-yet-four-year-old also rides a two-wheeler short distances while I jog after him and again, I'd like him to have better awareness and common sense. I'm not even totally sure what rules I should be teaching them.
Any recommended resources for this age group? Books/DVDs/etc.?