Worked Example: Setting Up a Lane Closure on a 60 km/h Suburban Road

A good lane closure set up on a 60 km/h suburban road puts advance warning out first, then the merge taper, then the buffer and work area, exactly as the approved traffic guidance scheme (TGS) shows. Crews work from the protected side, check the layout by driving it, and record each inspection.

This article walks through one realistic job from booking to pack-down. It is an example scenario, not a real client or incident, and it is written for supervisors, implementers and site managers who want to see how the steps fit together on the day. It is not engineering advice: the TGS must be prepared by a suitably qualified person, and every distance in it comes from the guidance that applies to that road. For how those distances are worked out, see our guide to lane closure traffic plans.

The example site and the job

Example scenario: a plumbing contractor needs to replace a stormwater pit in the kerbside lane of a four-lane undivided suburban road. Here is what the crew knows on the morning of the job.

• Road: two lanes each way, posted 60 km/h, no median, kerb and gutter both sides.
• Work area: the kerbside lane, roughly mid-block, with an excavator, a tipper and a small crew.
• Constraints: a bus stop about 80 metres past the work area, two residential driveways inside the closure, a side street entering from the left just before where the taper would start.
• Hours: 9 am to 3 pm, inside the road's permitted off-peak window.
• Documents: an approved TGS for a single lane closure at this location with a reduced speed zone, the road occupancy approval, the SWMS and the contractor's work method.
• Crew: a supervisor holding the implementation ticket, TC 1 and TC 2, and a ute with sign stands, signs, cones and an arrow board.

No stop/slow is needed because one lane stays open in each direction. The controllers are there to manage the side street, driveway access and pedestrians around the excavation.

Before the first sign: the pre-start and site walk

The job is really decided in the first 20 minutes. The supervisor arrives early, before the plumbing crew, and does three things in order.

1. Reads the TGS against the road. Is the side street on the drawing? Are the driveways shown? Is there a permanent 60 km/h sign inside the area where a reduced speed will be signed? Our guide on how to read a TGS covers the symbols and distance notes.
2. Drives the approach at the posted speed. Where will the first warning sign be seen? Is anything hiding it: a parked truck, a tree, a crest, the sun behind it?
3. Walks the site. Escape routes, where the ute will park, where the tipper will stand, and how pedestrians will pass the excavation.

In our example, the walk turns up a problem. The side street enters just before the taper. A driver turning left out of it would join the kerbside lane after the advance warning signs and before the merge. The TGS shows the side street, and it includes side-road warning signs, but the supervisor notes that the side street approach has a parked car where the sign stand would go. The fix is simple: the supervisor asks the resident to move it, and the sign goes where the TGS says. If the drawing had not shown the side street, the right move would be to stop and contact the designer, not to improvise. See changing a TGS on site for who can approve changes.

Then the pre-start briefing, with the plumbing crew present:

• the TGS, the work area boundary and the buffer, and who is allowed in it
• each person's role: supervisor sets out, TC 1 manages the side street and driveway, TC 2 manages pedestrians at the excavation
• radio channel and backup, and a radio check before anyone steps out
• escape routes for each position
• the plant: where the excavator will swing, where the tipper reverses and who spots it
• what happens if a vehicle enters the work zone or a resident needs driveway access
• SWMS sign-on by everyone, including the plumbing crew

The lane closure set up sequence, step by step

The rule of thumb that holds everywhere: place devices in the order drivers meet them, from the furthest upstream sign towards the work area, working from the kerb or footpath side, never with your back to live traffic. The exact positions, spacings, taper length and buffer come from the TGS.

Two points the crew in our example get right:

• Cover conflicting permanent signs. The permanent 60 km/h sign inside the reduced speed area is covered, with the cover fixed so wind cannot lift it. The covers come off at pack-down. Our guide to covering permanent signs at roadworks explains why a mismatch between permanent and temporary signs is a common audit finding.
• Measure, don't guess. Taper and sign spacing are measured with a wheel. A cone and taper calculator helps a supervisor check numbers against the TGS, but the TGS is what governs.

The drive-through and the first inspection

Before the excavator moves into the lane, the supervisor drives through the whole layout in both directions at the posted speed, ideally with a second person watching. The questions are the ones a driver will answer subconsciously:

• Did I see the first sign in time to read it?
• Was it obvious which lane was closed before I reached the taper?
• Was the reduced speed believable, or did the road look open and fast?
• Did the side street have its own warning?
• Was anything inside the buffer?

In the example, the drive-through finds one issue: the arrow board, placed where the TGS shows, is partly hidden by a street tree for drivers in the kerbside lane until fairly late. The supervisor does not move it on a hunch, because a device moved off the drawing is an unapproved change. Instead the supervisor calls the TGS designer, explains the sight line with a photo, and gets a recorded approval to shift the board a short distance to where drivers can see it. The call, time, name and change go into the site diary.

Then the first inspection is recorded on the project's form. NSW practice is to inspect at the start and end of every shift and at suitable intervals during it, plus weekly and after-care inspections where the closure stays. Record what you looked at and what you changed, with times and photos. Our inspection photos guide shows how to take evidence that stands up later.

During the shift: what goes wrong and the fix

Nothing in a lane closure stays exactly where it was placed. Here is how the example shift plays out.

10:20 am. The tipper parks in the buffer. The driver pulls up in the empty space between the taper and the work area because it is closest to the excavator. TC 2 calls the supervisor. The fix is to move the truck into the work area, not leave it in the buffer, because the buffer is the space that absorbs an errant vehicle's run-out. The supervisor reminds the plumbing foreman of the briefing point.

11:45 am. A cone is clipped at the taper. A van cuts the merge late and knocks two cones into the closed lane. The supervisor replaces them from the protected side and notes the time and vehicle in the diary. If strikes keep happening at the taper, that is a reason to review the layout with the designer rather than keep replacing cones.

1:10 pm. A resident needs to get out. One of the two driveways is inside the work area. TC 1 holds the excavator, walks the resident's car out through the work area at walking pace and back into traffic at a safe gap, then confirms with the operator before the bucket moves again. This was briefed at the pre-start, so it takes two minutes, not twenty.

2:00 pm. Mid-shift inspection. Signs still standing, covers still on, buffer clear, pedestrian route intact. Recorded with times.

Pack-down: reverse order, and nothing left behind

Pack-down is where crews are tired and keen to leave, which is why it is a high-risk part of the day. The principle is the reverse of set-up: remove from the work area back towards approaching traffic, so the last thing drivers see disappear is the first warning sign.

1. Work area clear of plant, workers and materials; the excavation reinstated or plated as the work method requires.
2. Pedestrian barriers and work area delineation removed.
3. End of works and speed restoration signs removed.
4. Buffer and taper cones collected, starting from the work area end of the taper and working back upstream.
5. Arrow board off and removed.
6. Lane status and side street signs removed.
7. Advance warning signs removed, furthest upstream last.
8. Permanent sign covers removed, and the permanent speed sign checked as visible.
9. A final drive-through: nothing left behind, no cone in a gutter, no sign stand on the footpath.

What gets recorded

The records are what prove the closure was done properly. In the example, the supervisor's record looks like this.

Keep these with the job. If a complaint, claim or audit arrives months later, the record will matter more than anyone's memory. For the national guidance behind lane closures, check Austroads, Standards Australia for AS 1742.3, and in NSW Transport for NSW, which replaced the TCAWS manual with TS 05492 in June 2026.

Next steps

Before your next lane closure, read the TGS against the real road, drive it at the posted speed, and brief the buffer rule and driveway access plan to the whole crew. Operators who want the pre-start, SWMS sign-on and inspection records captured on the crew's phones can do that in TrafWise.