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Night vision systems in vehicles are a new emerging technology. A crucial problem in active (laserbased) systems is distortion of images by saturation and blooming due to strong retroreflections from road signs. We quantify this phenomenon. We measure the Mueller matrices and the polarization state of the reflected light from three different types of road sign commonly used. Measurements of the reflected intensity are also taken with respect to the angle of reflection. We find that differentdoi:10.1364/ao.47.004003 fatcat:b3zs3ebxnncmfigx32ewsci67i