RRFB's are also approved for school use.
The RRFB is a rectangular shaped, high intensity signal head, which flashes in a wig-wag, rapid flickering pattern. The alternating signals provide direct, ultra-bright concentration as well as wide-angle intensity. The beacons are pedestrian activated: push button or passive detection (several options available).
Interim approval for the RRFB's can be found at the following site: