Mandatory, cautionary and informatory sign boards with high-intensity retroreflective sheeting — fabricated to IRC:67 shapes and ASTM D4956 reflectivity grades.
| Sheeting Grade | Typical Use | Standard |
|---|---|---|
| Engineer Grade | Urban roads, low-speed zones | ASTM D4956 Type I |
| High Intensity Grade | State highways, arterial roads | ASTM D4956 Type III/IV |
| Diamond Grade | National highways, expressways | ASTM D4956 Type IX/XI |