TR21 (TW-4.1)

Ice/Grit - This signage is used when Grit is applied to the road surface when ice forms. Advance warning signage spaced no more than 2 km apart, should be erected along sections of road when grit has been applied to the road surface when ice forms. Where several sections of affected road are in close proximity, the first section may have additional signage of NEXT " "km. for advanced warning purposes. Used on Level 1 Roads or Level 2/3 Roads.