Side Winds Post Mounted Sign - Diagram 581 R2/RA2 (Face Only)The sign side winds sign to diagram 581 warns that strong side winds are common and may make driving more difficult. You can expect to see this at exposed bridges, near shorelines or high altitudes. The sign may be used with For and a distance plate for where strong winds are to be expected for extended times such as a viaduct or high point. Where drivers are only to expect gusts of wind on the road, this should not be used and the warning sign should