Traffic monitoring device
First Claim
1. A traffic monitoring device particularly for use with a moving monitoring vehicle, comprisinga measuring instrument for measuring the relative speed of a vehicle to be detected with respect to the speed of the monitoring vehicle,a speed measuring means for measuring the speed of the monitoring vehicle,signal evaluation means to whicha relative speed signal from said measuring instrument indicative of the relative speed of the vehicle to be detected,the monitoring vehicle speed signal from the speed measuring means,an adjustable limit speed signal,a minimum relative speed signal, anda minimum monitoring vehicle speed signal are applied, and which comprisesmeans for comparing the speed of the vehicle to be detected with said limit speed, said comparison using said relative speed signal and taking into account said monitoring vehicle speed signal,means for comparing said monitoring vehicle speed signal with said minimum monitoring vehicle speed signal,means for comparing said relative speed signal with said minimum relative speed signal, andmeans for providing a releasing signal,if said comparison indicates exceeding of said limit speed by said vehicle to be detected, andprovided said monitoring vehicle speed signal exceeds said minimum monitoring vehicle speed signal, andfurther provided said relative speed signal exceeds said minimum relative speed signal, anda photographic camera for photographing the vehicle to be detected, and releasing means triggered by said releasing signal for automatically releasing said photographic camera.
1 Assignment
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Accused Products
Abstract
A traffic monitoring device mounted in a moving monitoring vehicle comprises a radar device for measuring the relative speed of a vehicle to be detected with respect to the speed of the monitoring vehicle. A speedometer measures the speed of the monitoring vehicle. By means of a releasing mechanism automatically triggered at adjustable limit speeds, a camera is released and the vehicle to be detected is photographed. The relative speed of the vehicle to be detected and the speed of the monitoring device are added in summing means. The sum then corresponds to the absolute speed of the vehicle to be detected. The camera is not released dependent on the relative speed but on the absolute speed of the vehicle to be detected. Thereby, all vehicles exceeding an allowed speed are detected without taking an unnecessary number of pictures.
38 Citations
13 Claims
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1. A traffic monitoring device particularly for use with a moving monitoring vehicle, comprising
a measuring instrument for measuring the relative speed of a vehicle to be detected with respect to the speed of the monitoring vehicle, a speed measuring means for measuring the speed of the monitoring vehicle, signal evaluation means to which a relative speed signal from said measuring instrument indicative of the relative speed of the vehicle to be detected, the monitoring vehicle speed signal from the speed measuring means, an adjustable limit speed signal, a minimum relative speed signal, and a minimum monitoring vehicle speed signal are applied, and which comprises means for comparing the speed of the vehicle to be detected with said limit speed, said comparison using said relative speed signal and taking into account said monitoring vehicle speed signal, means for comparing said monitoring vehicle speed signal with said minimum monitoring vehicle speed signal, means for comparing said relative speed signal with said minimum relative speed signal, and means for providing a releasing signal, if said comparison indicates exceeding of said limit speed by said vehicle to be detected, and provided said monitoring vehicle speed signal exceeds said minimum monitoring vehicle speed signal, and further provided said relative speed signal exceeds said minimum relative speed signal, and a photographic camera for photographing the vehicle to be detected, and releasing means triggered by said releasing signal for automatically releasing said photographic camera.
Specification