Light barrier test
A regularity test in which timing is controlled by photoelectric light barriers. Timing starts at the first barrier and ends at the second, triggered by the front of the car rather than the wheels.
The light barrier test (German Lichtschrankenprüfung) is a regularity test in which timing and monitoring are handled by photoelectric light barriers. Timing starts as the car passes the first light barrier and ends at the second (final) one. Unlike the pneumatic-tube test, which is triggered by the front wheels on the road surface, the light barrier reacts to the front of the car or its bumper at barrier height – usually above 50 cm. As with any regularity test (GLP), scoring is based on keeping to the set target time.
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Related terms
Light barrier
Photoelectric timing device that triggers the exact time as the vehicle passes – standard for timing special stages.
Pneumatic tube test
A regularity test whose timing is triggered by driving over pneumatic tubes – similar to the light barrier test, but via the wheels.
Pressostato
A pressure-sensitive tube laid across the road that, in Italian regolarità events, detects the front wheels passing over it and triggers the timing. Alternative: a photocell.