3TGS Design for Mobile Works#

3.5Step 3 – Determine the Needs of the Works Convoy#

3.5.3Shadow vehicle#

In subsection Truck mounted attenuators, add the following sentence after the 3rd paragraph:

Only TMAs included on the current list of accepted products in the Transport and Main Roads Accepted Road Safety Barrier Systems and Devices document must be used at roadwork sites in Queensland.

3.7Step 5 – Determine the Signs and Devices to Use#

3.7.1Advance warning#

Add the following notes to Figure 3.9:

The 40 m roll ahead distance must be kept free of workers on foot and items of plant.

The distance between the advance warning vehicle and shadow vehicle is 90 metres for this example.

3.7.2Signs mounted on vehicles#

Replace:

Vehicle mounted warning devices fitted with illuminated arrow signs must be fitted to all convoy vehicles and plant items. This excludes small plant items protected by a work vehicle and shadow vehicle. The sign mounted to the vehicle and illuminated flashing arrow sign must be the minimum size of:

with:

Vehicle mounted warning devices fitted with illuminated arrow signs must be fitted to all TTM vehicles in the convoy.

All work vehicles and items of plant in the mobile works convoy, other than minor items of plant protected by a works vehicle or a shadow vehicle, must display a vehicle-mounted warning device which when suitable may be fitted with an illuminated flashing arrow sign.

The sign mounted to the vehicle and illuminated flashing arrow sign must be the minimum size of:

In subsection Vehicle mounted warning device, delete the first paragraph:

All vehicles and items of plant in the mobile works convoy, other than minor items of plant protected by a works vehicle and shadow vehicle must carry a vehicle-mounted warning device fitted with an illuminated flashing arrow sign.

In subsection Vehicle mounted warning device, add the following:

On two-way roads, vehicle mounted warning devices fitted with illuminated arrow signs must be visible to road users from both approaches where warning for both approaches is required (see Figure 3.9).

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.

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.