In most cases, when a bus is going to pick-up or drop-off a student, the overhead yellow lights will start flashing several hundred feet before the bus stops. When the bus stops, the overhead red flashing lights will come on. When you see the yellow lights flash, slow down and prepare to stop. When the red lights come on, you must be stopped.
In some special cases, we do not use the overhead lights when we stop for students. If no students are crossing the road and the bus can get completely off the road, as is the case on M-44, we may use the 4-way hazard lights instead of the overhead lights. In this case, a motorist should slow down and proceed with caution past the stopped bus.