This sign is erected at all attended work sites or unattended work sites where there are hazards within 5m of the edge of the road. This sign should only be displayed when men or machines are working on the roadway or where the road surface is in a rough state during construction. If the length is more than 1km a TW1.1 - NEXT "" "" KM should be used to indicate the full length of the work site. At any time work is not in progress on the roadway, i.e.: overnight, and the road surface is in a reasonably negotiable condition, the signs shall be covered or removed, and this is the responsibility of the person in charge of the work part at the site. It can be used on Level 1 Roads.