Forbidden maneuver violations: camera installation requirements

1. The detection of a “Forbidden maneuver” violation requires the installation of video cameras monitoring entry to the intersection/start of maneuver, exit from the intersection/end of maneuver, and overview cameras. Each application function requires a corresponding type of video camera as listed in Table 1.

Table 1

Camera function	Abbreviation
License plate recognition of vehicles at the entry to the controlled road section. Detection of crossing a virtual line	LPR
License plate recognition of vehicles at the exit from the controlled road section. Detection of crossing a virtual line	LPR
Panoramic overview video camera	OV

2. To generate traffic violation events, LPR installation must comply with the requirements specified in Table 2.

Table 2

Characteristic	Requirement
Tilt	from 10° to +30°
Pan	from –20° to +20°
Roll	from –5° to +5°
Image quality at the boundary of the controlled zone	300 pixels/meter or higher
Illumination of the controlled zone	50 lx or higher across the entire scene
Camera mounting height	From 6 meters or higher above the road surface

3. To obtain additional data for evidence generation and better identification of secondary vehicle features, including at night, OV installation must comply with Table 3.

Table 3

Characteristic	Requirement
Tilt	from +15° to +75°
Pan	from –75° to +75°
Roll	from –5° to +5°
Image quality	50 pixels/meter or higher
Illumination	10 lx or higher
Mounting height	5 meters or higher

4. Camera placement for maneuver control at intersections.

4.1. Example LPR placement is shown in Figure 1 (red indicates entry cameras, blue indicates exit cameras).

Figure 1.

Diagram of a four-way intersection showing LPR camera placement and fields of view for forbidden maneuver detection, with red cones marking entry cameras and blue cones marking exit cameras

4.2. LPR field-of-view recommendations:

Cameras must capture front license plates.
Entry cameras must also capture the stop line (if present), located in the second third of the frame horizontally.
Exit cameras must include the intersection area in the upper part of the image.
Cameras should be installed as high as possible within the limits specified in Table 2.
Figure 2 shows the example images from LPR cameras (red indicates OV cameras overviewing the entry, blue - the exit).

Figure 2.

4.4. Example OV placement is shown in Figure 3 (red indicates OV cameras overviewing the entry, blue - the exit).

Figure 3.

Diagram of a four-way intersection showing OV camera placement, with overlapping red and blue field-of-view zones covering each entry and exit approach

4.5. OV field-of-view recommendations:

Entry cameras must capture the entry line and at least 8 m before and after it.
Exit cameras must capture the exit line and at least 15 m before it.

4.6 Figure 4 shows the example images from OV cameras.

Figure 4