Covering Permanent Signs and Removing Temporary Ones at Roadworks

Permanent signs that conflict with the temporary arrangement at roadworks are covered, and temporary signs are covered or removed as soon as the condition they describe ends. Covering road signs at roadworks should happen only as the approved TGS and road authority conditions allow, using secure, opaque covers, in a planned sequence, with a record of each cover.

It sounds like a small task. In practice, sign covering causes a surprising share of complaints, near misses and awkward questions after incidents. A permanent 80 km/h sign left visible inside a 40 km/h zone, a cover that blew off at 2 am, a detour route signed one way while the permanent direction sign still points the other: each of these puts drivers in a position where they have to guess. This guide covers which signs typically conflict, who approves covering them, how to cover them properly, the order of work, and how to make sure nothing is left behind.

Why conflicting signs matter

Drivers process signs quickly and act on them. When two signs disagree, drivers pick one, and different drivers pick differently. That spreads speeds, causes late lane changes and erodes trust in the whole layout.

Conflicting signs also cause problems after the event. If there is a crash or an enforcement dispute, the first questions are what signs were displayed, whether they were consistent and whether they matched the approved plan. A layout with an uncovered permanent sign that contradicts the temporary one is hard to defend. Speed limits and other regulatory signs are set under state law, so check how covered and temporary signs apply with your road authority and the current legislation on the NSW legislation website or your state's equivalent, rather than relying on site folklore.

Which permanent signs typically need covering

The TGS should show which permanent signs are to be covered. If it does not, and you find a conflict on site, raise it before work starts. Common conflicts include:

Traffic signals deserve special mention. Any change to how a signalised intersection operates, including covering lanterns or switching to flashing yellow, is a road authority decision and is usually done by the authority or its accredited contractor under an approved arrangement. Crews should not bag signal lanterns on their own initiative. Our guide to roadworks at signalised intersections covers this in more detail.

Who decides and who approves

Permanent signs are road assets owned by the road authority or council. That shapes who can do what.

• The TGS designer identifies conflicting signs and shows on the TGS which ones are to be covered. If you are new to plans, see our guide on how to read a TGS.
• The road authority or council approves the arrangement through the road occupancy licence, permit or contract. In NSW, state road works generally need a road occupancy licence, and conditions can cover sign treatment.
• The implementer or supervisor covers and uncovers signs as the TGS shows and records it.
• Traffic controllers report signs that conflict but are not shown on the plan.

Covering a sign is different from removing or altering it. Unbolting a sign, removing a post or changing a sign's position or height generally needs the asset owner's specific approval. If removal is approved, photograph the sign first, record its exact position, orientation and mounting height, store it safely, and reinstate it the same way.

How to cover a sign properly

A good cover is invisible to the driver in every condition. Plastic bags and gaffer tape are not good covers.

• Purpose-made and opaque. Use covers made for the sign size. They should hide the whole face in daylight and at night under headlights. Hold a torch behind a new cover in the depot; if you can read the sign through it, it is no good.
• Non-adhesive on the face. Tape on retroreflective sheeting leaves residue and can lift the surface. Secure covers with straps, ties or elastic around the sign or post.
• Secure in wind. A cover that flaps is distracting. A cover that blows off reveals the sign at a random time. Check covers at each inspection and after strong gusts.
• Complete, not partial. Do not cover part of a sign, such as one arrow on a lane sign, unless the TGS shows exactly that treatment. A half-covered sign is hard to read and easy to misread.
• Safe to install. Covering high-mounted signs, gantry signs or signs in a median can need an elevated work platform and its own traffic management. Plan that as a task, not an afterthought.

Covering temporary signs

Temporary signs that are not needed for a period, such as a "workers ahead" sign during a long break with nobody on the road, should be covered or removed according to the TGS and your procedure.

Turning a sign around is a common shortcut with two problems: drivers going the other way may now see it, and wind or passers-by can turn it back. Laying signs flat on the verge can create a trip hazard and leaves the sign easy to knock back up. Some procedures allow these methods in limited situations. Covering or removing the sign is usually more reliable.

The sequence: when to cover and uncover

The order matters. The goal is that drivers never see two conflicting messages, and never see no valid message where they need one, while workers or devices are on the road.

1. Brief the sequence at the pre-start. Name who covers and uncovers each permanent sign and in what order relative to the temporary signs.
2. At set-up, install the temporary signs that replace the permanent message, then cover the conflicting permanent signs, keeping the gap between the two as short as practical. Follow the order your TGS or procedure sets.
3. Record the time each permanent sign is covered and each temporary sign is displayed.
4. During breaks and after hours, follow the TGS. If an after-hours layout applies, the permanent signs that conflict with it stay covered; those that do not are uncovered.
5. At pack-down, remove the temporary signs and uncover the permanent signs so the road reads as normal once workers and devices are clear. Again, follow the order the TGS or procedure sets.
6. Drive through after pack-down to confirm every permanent sign is uncovered, undamaged and facing traffic.

For temporary speed zones, see our guide to work zone speed limits in NSW, which covers recording sign times.

Removing temporary signs when the condition ends

Signs that describe something that is no longer there destroy credibility. "Workers ahead" with no workers, "lane closed" after the lane has reopened, or a reduced speed limit on a finished road teach drivers to ignore signs, including the ones that matter tomorrow.

• Remove or cover signs as soon as the condition ends, as the TGS allows.
• Count signs out and back. Load a list of signs for the job and tick them off at pack-down. If one is missing, find it before leaving.
• Collect covers too. A permanent speed sign left covered for weeks after the crew has gone is a classic and avoidable failure.

Our traffic control demobilisation checklist covers the wider end-of-job sweep, and printable versions of our checklists are on the free checklists page.

Covered signs register and checklist

Keep a simple register for every job where permanent signs are covered:

• sign type and location (street, direction, nearest landmark or chainage)
• time and date covered and uncovered, and by whom
• the TGS and revision that required it
• a photo before covering and after uncovering
• condition on uncovering, including any damage

This is general information, not legal advice. Sign treatments are set by the approved TGS, prepared by a suitably qualified person, and the authority approvals for the job. AS 1742.3, available through Standards Australia, covers traffic control devices for works on roads, including covering and removal of signs.

Next steps

Add a covered-signs register to your next job pack and check it at every pack-down. If you run a traffic control company, TrafWise captures sign times and photos on digital dockets, so the record is complete when a client or authority asks.