Samenvatting
By experiments various questions relating to human ability to recognize, road and retain in mind the symbols on vehicle license plates were studied. The combination found to the best of all symbol combinations studied was the one consisting of two groups-three letters and three figures. In a further test the various types of reflecting license plates were test with regard to their lightness, legibility and influence upon the estimation of distance, as compared to vehicle licenses made of nonreflecting material.