THE COMBINATION OF RETROREFLECTIVE MATERIALS ON ROAD SIGNS

Combination of retroreflective materials from the perspective of optical performance is essential for temporary road signs placed in areas of road works while driving at night. The measurements of white traffic sheetings in the measured viewing angle alpha = 0.33 degrees and the illumination angle beta = 5 degrees proved, that there are more significant optical differences in the tapes formally included in the RA2 class, as the two tapes 3M 3930 and OR 5910 have values of around 600 cd.lx(-1).m(-2). However, the third tape tested, AD 6500, only has values of around 405 cd.lx(-1).m(-2). Significant differences are seen in traffic sheetings formally classified as RA3, since the AD 7500 and OR 6910 samples have values of around 430 cd.lx(-1).m(-2). However, the third 3M 4090 traffic sheeting in the same formal class has values up to 764 cd.lx(-1).m(-2).