3TGS Design for Mobile Works#

3.8Step 6 – Identify the Operational Procedures to be Followed#

3.8.4Mobile temporary speed zone#

Replace the entire Section 3.8.4 with the following: To improve the safety of road workers and road users, a temporary speed limit may be applied to mobile works. When mobile works involve workers on foot or using small ride on plant within the lane or within 1.2 m of traffic, a temporary speed limit of 40 km/h must be applied. The mobile work zone must be established using Speed Restriction signs or Speed Limit AHEAD signs located on vehicles in the mobile works convoy. Temporary speed limits must also be terminated on the vehicles in the mobile convoy. Depending on the works convoy arrangements and speed limit requirements, the work vehicle (or plant item) and the shadow vehicle may be used to display speed limit signs. On undivided roads where traffic travels past the mobile convoy in both directions, temporary speed limits for the safety of road workers or road users must be applied for both directions of travel. In this case, at a minimum, the speed zone must be implemented between the work and shadow vehicles. For works where a lead vehicle is not required, at a minimum, the speed zone must be implemented between the work vehicle (or plant item) and the shadow vehicle. All temporary speed limits require a risk assessment to determine the appropriate speed limit. If a risk assessment indicates an unusually high risk to workers at a particular site, a speed limit lower than 40 km/h may be required. When the need for the temporary speed limit is no longer applicable, the speed limit should be removed or altered to an applicable value; for example, when a 40 km/h speed zone is implemented for workers on foot or using small ride on plant within the lane or within 1.2 m of traffic and workers are no longer in this area, the temporary speed limit implemented for them must be removed and, if applicable, an alternative speed limit for the safety of road workers and road users may be implemented. Ensure that the temporary speed zone is terminated by a Speed Restriction or END Speed Limit sign. The END Speed Limit sign will trigger the default built up or open road speed limit.

In Queensland where an END Speed Limit sign is used, the speed limit which applies following this sign is the default speed limit applicable for that road environment of either a built-up area of 50 km/h or for a road that is not in a built-up area of 100 km/h.