Patent ID: 8115670

Claim:
A method of measuring the speed of a vehicle comprising directing a radar beam from a radar system at a road such that several vehicles at the same time can drive through the measuring range defined by the radar beam and so that part of the radar beam is reflected by a minimum of one vehicle; comparing the reflected beam portion to the radar beam directed at the road; deriving from said comparison measured values for the speed and the distance from the radar system linked to the vehicles; comparing the derived speeds to a maximum permissible speed; activating a camera for creating an image if a derived speed is higher than the maximum permissible speed, with the derived speed and the vehicle for which the excessive speed was derived being contained on the image; continuously deriving the measured values several times throughout the duration of the passage of the vehicles through the measuring range; assessing the plausibility of previously measured values by means of subsequently derived measured values; using the measured values of the distances to characterize the vehicle lanes of the reflecting vehicles relative to the distance from the radar system; and marking the vehicle lane of the vehicle in the image, linked to the vehicle for which the excessive speed was derived.