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Similar installations are applicable for measuring the speed of both approaching and departing vehicles (from 10 up to 250km/h). The final speed information is available 20–30 milliseconds after the vehicle has passed the measurement point.
Speeding trigger information for the camera is arranged in two phases: first a rough speed value for the trigger is available in a few milliseconds followed by final speed value after data processing in 20–30 milliseconds. This procedure guarantees reliable speed measurement results even in the case high speed vehicles are driving close to each other.
The compact and small size Noptel laser radar can be placed into the camera housing together with the camera pointing to the same direction. However, thanks to the delayed camera triggering feature the Noptel laser radar can be pointed further on the road than the camera.
Therefore, the operating distance of the camera doesn’t restrict the operating distance of the Noptel laser radar and the triggering window of the laser radar for speed measurement can be defined to the desired distance (typically to 30 – 40 m). Furthermore, secondary speed verification is available for the camera image.