Safely Back to Work - 36 - November 2020 Social Distancing power ; Requires high system memory lighting conditions LiDAR Occupancy Tracking ; Social Distancing Privacy is preserved ; Near Realtime Requires high processing power High High Up to 100 meters PiR Sensors Occupancy Tracking Privacy is preserved Does not detect stationary people ; Cannot distinguish number of people Low Low Up to 10 meters Infrared Cameras Occupancy Tracking ; Social Distancing Privacy is Preserved ; Near Realtime Accuracy declines if individuals are close together Medium Medium Depends on camera resolution , focal length , lighting conditions WiFi Occupancy Tracking Can be integrated with existing system Gives wrong measure of occupancy if a person is carrying > 1 device or no devices connected to Medium Low Up to 50 meters