Chapter 4 — Your Driving 46 Two-lane roadway with a center turning  lane:  When school bus stops for passengers, all  traffic from both directions must stop. Roadway of four lanes or more with a  center turning lane: When school bus stops  for passengers, only traffic following the bus  must stop. Emergency and Law Enforcement Vehicles Police cars, ambulances, fire engines and rescue vehicles with flashing lights  and sirens always have the right of way. Follow these guidelines when approaching or being approached by an  emergency vehicle: • As the emergency vehicle approaches (from ahead or behind), drive to the  right-hand curb or edge of the road and stop completely; • Remain stopped until the emergency vehicle has passed, or until directed to  move by a traffic officer; • Do not park within 100 feet of an emergency vehicle that has stopped to  investigate an accident or to give assistance; All vehicles, regardless of direction of travel, must yield right of way to an approaching emergency vehicle. This does not apply to vehicles  traveling in the opposite direction of the emergency vehicle(s) when traveling on a four-lane limited-access highway with a center median. • Do not drive or park closer than one block from fire trucks responding to a  fire alarm; • Never drive a motor vehicle over a fire hose. Four-lane roadway without a median separation:  When school bus stops for passengers, all traffic from both directions  must stop. Divided highway of four lanes or more  with a median separation:  When school bus  stops for passengers, only traffic following the  bus must stop.