Red Light GATSO &
Traffiphot III
Left: GATSO: Type
36 Inductive Loop. Right: Peek Traffic: Traffiphot III
G Piezo Sensor
These cameras monitor the traffic signals. They
are positioned between twelve and twenty metres before the stop
line. The state of the signals is monitored and the device is
'armed' when the red light is illuminated. When a vehicle crosses
the stop line against the red light it passes over loops situated
under the road surface just past the stop line. This triggers
the camera, which takes two photographs. One is taken immediately
and one a second later to show the passage of the vehicle through
the signals. The date and time of the offence, together with the
time which elapses after the red light is illuminated, are recorded
on to the film. The camera also records data regarding the amber
light so that the correct sequence of the lights can be proved.
In addition the camera monitors the speed of vehicles as they
cross the stop line.
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