The laserjammer GF10 makes speed measurements with the help of a laser beam impossible. Correspondingly vehicles with mounted GF100 can not be speed-measured. A laser equipment sends out for the purpose of a speed measurement an infrared beam in intervals which is reflected by the targeted vehicle. Now the exact speed of the vehicle is calculated by the recognition of these reflections on the separately sent out rays. These calculations are based on the unambiguous allocation of the bright reflections. If additional bright impulses should appear, however, in the targeted aim in the same frequency range, no unambiguous allocation of the reflected rays and therefore no calculation of the speed can take place. The laser misery of GF100  emits invisible multifrequent infrared light for the eye. Now after hitting of a laser beam on the vehicle front are reflected near the real bright reflection a multiplicity of other bright impulses in direction laser pistol, so that there no measurement can take place. Both emitters are fastened inconspicuously to the front part of the vehicle. Because two emitters are used, is guarded the entire vehicle front, also the bigger vehicles. The outside mirrors are included correspondingly by the emitted bright frequency, too. The Laserjammer GF100sends out the bright frequency at the operation of the vehicle meaningfully continuously, because emitting the frequency as a reaction to a received laser signal could already be too late.