Device for testing the operability of speed-measurement...

Details Device for testing the operability of speed-measurement... Device for testing the operability of speed-measurement...

G - Physics

08

G

G08G 1/054 (2006.01) G01D 18/00 (2006.01) G01P 21/02 (2006.01)

Patent

CA 2134659

2134659 9322756 PCTABS00027 Stationary speed-measurement devices used in traffic control have sensors laid in the road surface which react to vehicles that pass over them and which generate speed measurement values; when an admissible speed limit is exceeded by a vehicle driving over the sensors, a picture of the vehicle is taken by a camera. In order to test the operatability of such speed measurement devices, error recognition means prevent the speed measurement values from being taken into account when certain error criteria occur. Counters are provided for counting the frequency of occurrence of error criteria. A determined statistical distribution of the occurrences of the various error criteria results for each installation. When deviations from this distribution are detected, that means that the installation needs to be modified.

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