Indiana State Police remind you of the importance of watching for stopped school buses while they are picking up and dropping off students. You also need to know school bus laws, and when to stop. Two-Lane RoadsIf a school bus stops on a two-lane road and the red flashing lights are activated and the stop arm is extended, all motorists must stop. Multi-Lane Roads with No Barrier between LanesWhen a school bus stops on a multi-lane roadway without a barrier and the red flashing lights are activated and the stop arm is extended, all motorists must stop. Multi-Lane Roads with a Grassy and/or Concrete BarrierWhen a school bus stops and the red flashing lights are activated and the stop arm is extended, only vehicles behind the bus must stop.