Tracked Changes. Specification for retroreflecting number plates|Impact testing, Graphic characters, Bend testing, Corrosion tests, Thermal-cycling tests, Marking, Photometry (light measurement), Performance testing, Reflective materials, Layout, Reflection factor, Specimen preparation, Thermal testing, Digits, Luminance, Retroreflective materials, Road vehicle components, Vibration testing, Colour, Registration plates (vehicles), Letters (symbols), Vehicle components, Salt-spray tests, Design, Test equipment, Dimensions, Number plates, Visual inspection (testing), Chromaticity, Environmental testing, Artificial weathering tests, Solvent-resistance tests