One other thing I would like to add...
Lately I have been seeing a lot of moms jumping into the street and trying to flag down cars in an attempt to bring in business for their kids. PLEASE don't do this! I live in fear that the kids will see the mom doing it and do it themselves when the mom is not around. The consequences could be tragic.
Also, I always stop for the kids in the neighborhood, but when I see moms out there trying to drum up business, it really turns me off. Just my opinion.

Supervise the kids from a distance, and let the kids do the work--that is half the fun!