Not all busses do, you can look at many examples that they don't, but since apparently yours do, I would assume they are meant for visibility reasons, or for identifying a particular route, or bus.
a blue whale is 3 double-decker buses
Yes. Blue lights are only legal for law enforcement personel. In Pensylyania volunteer firemen are allowed to have them. But NOT in West Virginia. Ther are even laws regarding signage and store fronts with blue lights and have to be so many feet back from the road.
Jew Blue Lights
Some of the buses are red, others are blue, red and white and occasionally green.
Yes, such as a Blue Bird Vision, but only some school buses are compatible.
Well,yes,depending if you are in the midlands.
yes because back in the 1980s we had no Flat nose buses
Blue
yes as long as they are not on the dash or con the back ledge
White with red, blue and black accents.
At 882 ft 6 in (269 meters), four buses back-to-back are still not as long as the Titanic.
Blue Lights in the Basement was created on 1977-12-13.