Abstract: A safety device for mounting on school buses is provided. The device includes light assemblies so as to be visible in their on and flashing modes only within certain horizontal arcs which describe certain areas parallel to and in front of school buses. School children exiting the school bus are directed by the initial light to proceed to a first position located on the side of the road, in sight of the school bus driver and where a first light is visible. The school children are then directed by the first light to move to a second position in which a second light is visible. The second position is immediately in front of the school bus, and in sight of the driver. The driver then indicates to the children, via the second light source, to proceed with crossing the roadway only after the driver has ascertained that it is safe to do so.