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1. A trailer for traffic monitoring, wherein the trailer comprises a body, a chassis with a drawbar, and an axle with wheels, and further comprises
means which enable the wheels to be raised and lowered so that, in a lowered state, the trailer is ready to run and, in a raised state, the wheels are not in contact with ground and the trailer therefore rests on the ground via the body thereof, at least one system for detecting and documenting at least one of red light infringements and speed infringements, a housing top unit arranged on the body, said top unit comprising two racks which are designed to accept a radar device comprising a radar antenna and at least one recording unit and are arranged toward a front and toward a rear of the trailer and in each case at an angle of less than 45° to the drawbar, so that, when the trailer is parked at a side of and parallel to a road, radar radiation is at an angle α of a radar axis to a direction of a roadway which is likewise less than 45° .
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