http://www.youtube.com/watch?v=-eS5CtV2s2c (commentary in French)
This radar not only detects the guy speeding, in any lane, but can differentiate between types of vehicle with different limits, such as heavy goods vehicles, trailers etc. The secret is a detector mounted on the barrier rail which determines the type of vehicle and the lane it is using and transmits the info to the radar which adjusts the limit at which it flashes, automatically. In the example shown, the big truck in the nearside lane is being flashed while the cars in the two lanes nearer the camera are travelling faster legally. To avoid contests, the doppler radar triggers the flash above the set speed for the type of vehicle, but the distance moved between the two flashes at a fixed interval is used to calculate the speed a second time.
In the opening sequence (after the commentator) the old type radar box is shown and then the new ones, which cost only half the price of the old ones. In the Canton of Vaud, they have installed 20 such boxes between the border with Geneva and Lausanne, about 45 km of highway. The accident rate has since dropped by over half (they don't say how much they've raked in with fines!!!!), but it's a foolhardy driver who exceeds 120 km/h along that stretch today.
This radar not only detects the guy speeding, in any lane, but can differentiate between types of vehicle with different limits, such as heavy goods vehicles, trailers etc. The secret is a detector mounted on the barrier rail which determines the type of vehicle and the lane it is using and transmits the info to the radar which adjusts the limit at which it flashes, automatically. In the example shown, the big truck in the nearside lane is being flashed while the cars in the two lanes nearer the camera are travelling faster legally. To avoid contests, the doppler radar triggers the flash above the set speed for the type of vehicle, but the distance moved between the two flashes at a fixed interval is used to calculate the speed a second time.
In the opening sequence (after the commentator) the old type radar box is shown and then the new ones, which cost only half the price of the old ones. In the Canton of Vaud, they have installed 20 such boxes between the border with Geneva and Lausanne, about 45 km of highway. The accident rate has since dropped by over half (they don't say how much they've raked in with fines!!!!), but it's a foolhardy driver who exceeds 120 km/h along that stretch today.
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