My 5 yr old would rail against this one contractor who would block the sidewalk on his way to school (van longer than the driveway of the house he was working on). He bikes on training wheels so hopping off the curb mid-block is not really feasible for him. Fortunately, I guess, when they're running in and out of the house during the school rush they're not listening for the voice of a kindergartener old scolding them. I'm actually trying to get him to commute in the street rather than on the sidewalk but that's got another set of obstacles.