Lower mounting heights (at signal indications' height) would not provide an effective image. Why are the cameras attached to the signals so high?Ī higher mounting position allows for a better angle and wider view, which in turn generally lets one camera to cover all lanes in a particular direction. If there is not other, higher priority traffic, the signals are then changed accordingly to provide a green light for the incoming traffic at the intersection. When the vehicle enters the defined detection areas or "zones" within the camera's field of view, the camera's processor detects a change in the "zone." That alert is sent to the signal's controller (the computerized "brain" housed in a nearby metallic cabinet controlling the intersection's timing) that says a vehicle is requesting green time for its direction. Outside of those times, they may operate using detection. Often, signals during rush periods are timed to help improve the flow of traffic. The cameras are not focused on the drivers of vehicles, but instead on the vehicle as it moves towards the intersection. They are cost-effective replacements for in-ground induction loops that are cut into the pavement. MoDOT uses cameras at signalized intersections solely for detecting the presence of vehicles in order to adjust signal timing, as needed, based on traffic demand. Camera views are also provided to the local media through agreements to provide additional information in media traffic reporting efforts. Since traffic is slow or stopped, the potential for additional crashes is increased during major incidents, and operators need to watch for those crashes and direct emergency response forces there, as well.Ĭamera views and videos are provided on MoDOT's Gateway Guide to offer drivers the opportunity to review and evaluate the flow of traffic on their projected route, and determine if they need to use an alternate route. During crashes or incidents, cameras may not remain pointed at recovery efforts as operators continue to monitor the flow of traffic behind the incident. Video and photos from the cameras are only available in real time and are not stored. Operators use this information to convey messages to the public to detour motorists away or around these congestion points. The cameras are also used to monitor the backup from road work zones. The operators can use the cameras to identify potential congestion-creating incidents, such as crashes and stalled vehicles, and are able to direct the appropriate emergency response forces to those incidents. The video from these cameras is live, not recorded, and they help MoDOT’s Transportation Management Center operators monitor traffic flow. MoDOT has cameras installed along interstate highways and state routes in the St.
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