If at all possible, position the cabinets so that the ‘eyes’ have a 10° angle from direct early morning or late afternoon sunlight.

Set the line of sight across the roadway, parallel (or as close as possible) to the slope of the road in the direction of interest. See Figure 7 (page 8), Cross Section of the Road.

The height of the detection zone should be adjusted down from the desired height until there are an excessive number of false alarms, then up until the false alarms disappear. This provides a practical adjustment for uneven roads.

Tilt the REMOTE and MASTER cabinets to make the plane described by parallel lines of sight between the REMOTE and MASTER eyes parallel to the roadway under the lines of sight in the direction of interest. See Figure 8 (page 8), View Across the Roadway.