The STEM School Chattanooga InvenTeam invented a system to detect bicyclists in protected bike lanes and signal drivers of their presence. The flush-mounted ultrasonic detectors are mounted to curbs. The detectors triggers an overhead signal located near the standard traffic lights to warn drivers of a bicycle in their blind spot. Bicyclist count, direction of travel, and speed data are sent to the city of Chattanooga to understand traffic patterns, triangulate their data with existing 360-degree video, and improve safety for bicyclists and drivers.