(Greenfield, MA) With back to school season, comes school buses and area police departments are cracking down on vehicles passing school buses and student transportation vehicles illegally. Greenfield Police are reminding residents that when school buses and vans have their red lights flashing, whether they have a stop sign extended or not, vehicles on both sides of the road must come to a complete stop. Greenfield Police are monitoring bus routes and issuing tickets for failure to stop.