Housing and Development Newsletter The city constructed a PHB (formerly known as a High Intensity Activated crossWalK (HAWK) ) system on mast arms over the Calle Real travel lanes at Kingston Avenue. The PHB system replaced the previous old-style yellow flashing beacons at this three-way intersection. The PHB system is a hybrid of a flashing beacon and a traffic signal and is another federally approved MUTCD signal for pedestrian-actuated crosswalk enhancements. The PHB includes a signal face suspended above the roadway that has two red lenses above a single yellow lens. The system remains dark until pedestrian-activated. When activated, the signal flashes yellow, then a steady yellow, followed by a steady red, and finally alternate flashing red lights. The primary benefit is the requirement for all vehicles to stop for the red light. Vehicles may proceed when the red light is flashing and it is safe to do so.