Soil Compactor / Roller Operations SWMS

Soil compactor and roller operations are a routine but high-consequence activity on civil earthworks, road construction, and subdivision sites across Australia. This SWMS covers the safe operation of single-drum smooth rollers, padfoot rollers, and tandem rollers used to compact sub-grade, sub-base, and asphalt pavement layers, including integration with nuclear density gauge testing and coordination with grader and water cart operators. The work is classified as High Risk Construction Work under WHS Regulation 2025 Schedule 1 because it involves the use of powered mobile plant in proximity to ground workers, surveyors, and other plant. Roller operations create serious risks of crushing, run-over, rollover on batters, and exposure to whole-body vibration and noise. A documented SWMS is mandatory before work commences, must be developed in consultation with operators and ground crew under s47, and must be reviewed whenever the work area, plant, or compaction methodology changes.

Hazards identified

7 hazards covered, sorted by priority.

Control measures

Hierarchy-of-controls order: elimination → substitution → isolation → engineering → administrative → PPE.

1. 1Elimination — Where compaction specification permits, design out roller passes near edges by widening fill batters beyond drum width plus 1.5m safety margin during earthworks design phase.
2. 2Elimination — Prohibit ground workers within the active compaction exclusion zone (minimum 10m radius) during roller operation through physical work-zone segregation.
3. 3Substitution — Specify remote-controlled trench rollers for confined or steep-batter compaction work instead of conventional ride-on units to remove operator from rollover envelope.
4. 4Substitution — Replace nuclear density gauges with non-nuclear electrical impedance gauges where project specification allows, eliminating ionising radiation source entirely.
5. 5Engineering — Ensure all rollers are fitted with compliant ROPS/FOPS, reverse cameras, 360-degree proximity detection, reversing alarms, and amber rotating beacons per AS 2294.
6. 6Engineering — Install vibration-isolated suspended operator seats meeting ISO 7096 EM3 class to reduce whole-body vibration transmission below daily action value.
7. 7Administrative — Implement a documented spotter and positive communication protocol using UHF channel allocation, hi-vis flags, and three-point eye contact before any roller movement near workers.
8. 8Administrative — Verify operator high-risk work licence (LR class) or VOC currency, conduct daily pre-start inspection per AS 2550.1, and enforce maximum 6-hour vibration exposure shifts.
9. 9Administrative — Establish density-tester safety zone with roller stationary and park brake engaged before tester approaches; lock-out roller controls during gauge readings.
10. 10PPE — Provide Class D/N hi-vis garments per AS/NZS 4602.1, Class 5 hearing protection per AS/NZS 1270, safety footwear AS/NZS 2210.3, and sun protection for ground crew.

Applicable Codes of Practice

High-Risk Construction Work triggered

Worked example

On a regional highway widening project, the pavement crew is preparing to compact a 600m section of newly placed unbound granular sub-base using a 12-tonne single-drum smooth roller, with a nuclear density gauge operator from the geotechnical subcontractor scheduled to take readings every 50m. At the 6:30am pre-start brief, the site supervisor walks the four-person crew (roller operator, water cart driver, density tester, and traffic controller) through this SWMS hazard by hazard. The roller operator confirms his VOC is current and produces yesterday's pre-start checklist; the density tester confirms her ARPANSA-compliant gauge handling licence. The crew identifies that the work zone abuts a 1.2m batter on the southern shoulder — Hazard 2 — and agrees to keep the roller drum a minimum of one drum-width from the batter edge, with the supervisor marking a no-go line with spray paint. UHF channel 18 is allocated for positive communication. All four workers sign the SWMS sign-on register. Mid-shift, the density tester needs a reading near the batter edge; following the control protocol, the roller operator parks, engages the brake, dismounts, and physically signals clearance before the tester enters the zone. The SWMS is annotated to reflect the revised batter offset and re-signed by the crew before resuming.

Related legislation

• WHS Act 2011 (model)
• WHS Regulation 2025
• AS 2550 — Cranes, hoists and winches; AS 1418 series