Risk of Ice or Packed Snow Ahead Post Mounted Sign - 554.2 R2/RA2 (Face Only)The temporary warning sign for ice or packed snow, along with the supplementary plates Ice and Snowdrifts are to warn drivers of an especially dangerous area of the road due to heavy snowfall or icing. The sign must be removed when conditions return to normal. The sign should be used wherever snowfall is easily packed and layered, or where ice is common due to the shape and positioning of the road. This diagram should be used with plates; Ice, where