Red light violations: minimum camera count
The minimum required number of video cameras depends on the intersection configuration (number of traffic directions, number of lanes in each direction, spacing between lanes, and the availability of mounting structures), as well as on the technical specifications of the video cameras.
To ensure basic operation of the Software for detecting “Red light” violations, it is sufficient to install three video cameras per controlled direction (entry, exit, and traffic light). It is permissible to combine multiple functions within a single video camera. Such combination is allowed provided that the intersection configuration enables installation of the camera in compliance with the requirements for placement, field of view, and technical characteristics applicable simultaneously to multiple camera types.
To minimize occlusion within the camera field of view, it is recommended to use one LPR camera per two traffic lanes in each direction for monitoring entry to and exit from the intersection, as well as one TL camera per entry to monitor traffic light signal changes and to capture both the traffic light and the vehicles crossing the entry line. For intersections with a large number of lanes in one direction, it is recommended to install additional TL cameras to ensure that both the vehicle and the traffic light are captured within the camera’s field of view.
The use of additional video cameras is recommended when an additional observation angle is required and to enhance the evidentiary base when generating evidence materials.
Therefore, if it is necessary to monitor all traffic directions at an intersection of two roads (with two lanes in each direction), and it is not possible to combine functions within a single camera (i.e., the camera’s field of view and technical characteristics do not allow simultaneous monitoring of entry and exit line crossings or simultaneous monitoring of traffic light signals and entry/exit line crossings), then install 8 LPR cameras (Figure 8) and 4 TL cameras (Figure 9).
Figure 8.
Figure 9.
