Mindful of the traffic along Shadowlawn Avenue in Greencastle, Danielle Miller takes advantage of Community Clean-Up Day Saturday to provide a teaching moment for son Caleb Rollins, 7. Miller said her son has often asked aloud why people throw trash out their car windows, littering the landscape. Saturday he got to see firsthand the effects of that as he and his mother volunteered for the community clean-up and policed the area in the 300 block of Shadowlawn.