A traffic light indicator is situated at the bottom the screen. This is designed as a subtle way to inform people as to whether there are any alerts or events they should be aware of. All residents, staff, visitors and contractors are encouraged to monitor the traffic light status as they move around the facility. Simply put, green means everything is OK, yellow means that there is an incident or event that people should be aware of, but not alarmed by, and red means that there is an incident or event which warrants careful attention. The traffic light reflects the highest priority of any content currently in rotation. If a batch is sent to output containing nine green slides and one red slide, the traffic light will permanently stay red until the red slide is removed from output. Red slides are shown every second slide whilst yellow slides are shown every fourth slide. The image below indicates that everything is OK and there are currently no issues on site.