ROADWAY SAFETY GLASS BEADS For normal usage for Roadway and airport safety markings beads: 1.5 index, 1.6index glass beads to AASHTO type 1, 2,3,4,5, BS6088 Class A & B, Australian & New Zealand Standard, EN1423 & EN1424 MOT drop on & Premix, AS/NS,NBR6831, TT-B-1325C For the highest level of nighttime roadway safety in rain, fog, or melting snow, you can rely on all weather beads, 1.6