Speed Camera (photo radar in the USA) must be
positioned absolutely parallel to the traffic
flow. If not, the device will produce incorrect
speed readings. This is the "away"
mode (pictured) where the radar beam is angled
at 20 degrees across the road in the same direction
as the traffic flow. Any vehicle above a preset
speed has the rear license plate photographed.
The "towards" mode angles the beam
at 20 degrees towards the oncoming traffic and
photographs the front license plate. The "both"
directions mode can be used to check all vehicles.
Cameras are used in Queensland and Victoria.
The Traffipax units in New South Wales and South
Australia work in the same manner. Western Australian
Speed Cameras are Multanovas from Switzerland.