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Old 2009-11-11
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Exclamation German Court Questions Laser Speed Camera Accuracy

Article: German Court Questions Laser Speed Camera Accuracy

Poliscan speed cameraA German court last month overturned a traffic citation after prosecutors failed to prove the accuracy of a new laser-based speed camera technology. The district court of Dillenburg heard testimony from four experts, each of whom cast doubt on the system. The Judge Matthias Gampe concluded that the motorist accused by a Poliscan automated ticketing machine of driving 96km/h (60 MPH) in a 40 (25 MPH) zone was not guilty.

Manufactured by Vitronic in Germany, the Poliscan system is mounted in tall roadside poles or in a more compact mobile version. It uses lidar to estimate a vehicle's speed across multiple lanes over a distance of 130 feet. Vitronic boasts that the ability to simultaneously track multiple, individual cars on a multilane highway gives its product a competitive advantage over conventional products that use radar or in-pavement sensors to estimate speed.

Several of the devices were installed in Mannheim in 2007. After receiving complaints about erroneous readings, the city temporarily put a hold on 19,000 citations while an outside firm created a report that confirmed the cameras were accurate. Expert witnesses testified that changing lanes or having a vehicle cross between your car and the camera could confuse the system and cause misidentification. As the court found, there is no external means of verifying that the speed estimate generated is accurate because the system does not photograph vehicles at set distances like conventional systems.

Vitronic counters the criticism by admitting the theoretical accuracy problem is irrelevant when compared to the hundreds of thousands of tickets that have been "confirmed with approvals of competent state authorities." Nestor Traffic Systems had exclusive rights to distribute the Poliscan system in the US before going bankrupt. American Traffic Solutions acquired Nestor earlier this year.

The court case number is 3 OWi 2 Js 54432/09. Source
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