Every day, across the UK and Ireland, roads maintenance workers stand in live traffic.
They stand in it while they set up traffic management. They stand in it while they unload equipment. They stand in it while they break out defects, fill them, tamp them, and clean up. A traditional cold-lay or hot-box repair crew of three to five people spends the majority of its working day in proximity to moving vehicles, on roads that were not designed with that proximity in mind.
This is so normal in highways maintenance that it has become invisible as a risk. It is simply how road repair works.
Except it isn’t how all road repair works.
Zero workers in live traffic
The Roadmaster spray injection patcher is operated by a single person who controls the entire repair process from inside the cab.
The operator carries out the entire repair from inside the cab, then drives on to the next defect.
No one stands on the road. No one stands in traffic. No one is exposed to a vehicle that has failed to see a workman, failed to observe a cone, or failed to stop in time.
For the duration of every repair — regardless of road type, traffic volume, or weather conditions — the operator is inside a vehicle. That is the health and safety baseline from which this machine operates, and it is substantially different from what traditional methods require.
Why this argument is underused
The spray injection patching industry tends to lead with cost comparisons and productivity data. These are compelling and important. But the health and safety case is, if anything, more fundamental — and it is almost entirely absent from how the technology is discussed.
Pat Fitzgerald, then Machinery Yard Supervisor at Tipperary County Council, operated Roadmaster machines from 2002. When asked what the benefits are, he doesn’t start with the cost per repair. He starts here: “From a health and safety point of view, they are safer. It’s far safer to have one operator in a truck. That’s a big benefit — and it’s an issue that’s going to get more prominent.”
He said that years ago. The trajectory he identified has continued. Highways worker safety has become an increasingly scrutinised area of local authority risk management. Near-miss reporting requirements have tightened. Duty of care obligations have expanded. The regulatory and reputational consequences of a serious highways worker incident are significant.
The lone worker question
One objection sometimes raised about single-operator machines is the lone worker dimension — a single operator working remotely without immediate support in case of incident.
This is a legitimate consideration, and one that road maintenance programmes manage through check-in protocols, GPS tracking, and operational procedures. It is worth noting, however, that a lone operator inside a vehicle is in a fundamentally different risk position from a crew of three to five workers standing in live traffic. The comparison is not between lone worker risk and no risk — it is between different risk profiles, and the question of which profile is more manageable.
Most authorities that have operated single-operator spray injection patchers for any length of time reach the same conclusion: the reduction in live traffic exposure outweighs the lone worker dimension, particularly when appropriate operational protocols are in place.
The HSE context
The Health and Safety Executive’s guidance on roadworks safety identifies the presence of workers in live traffic as the primary risk factor in highway maintenance. The hierarchy of control — eliminate, substitute, control — would suggest that a method which eliminates worker presence in live traffic altogether sits at the top of that hierarchy.
That is precisely what single-operator spray injection patching does. It eliminates the exposure rather than controlling it through PPE, traffic management, and behavioural compliance.
What this means for procurement
Health and safety considerations are increasingly appearing in the evaluation criteria for term maintenance contracts and equipment procurement. Councils and contractors that can demonstrate a systematic approach to worker safety — through method, not just procedure — are in a stronger position on both sides of the tender table.
For councils awarding contracts: a method that keeps workers out of live traffic reduces the council’s own duty of care exposure for contractor workers operating on their roads. For contractors bidding: a demonstrable commitment to the safest available method is a differentiator in a market where quality of service is increasingly evaluated alongside price.
The machine that changed the exposure
The Roadmaster SP500 was designed from the outset around the principle that the operator should be safe. Liam McNamee, who built the first machine in 1999, made it a founding design requirement: one operator, inside the cab, for the entire repair process.
Thirty years later, that principle is embedded in every machine Roadmaster builds. It is not an optional feature or a safety add-on. It is the architecture.
Roadmaster single-operator spray injection patchers are used by councils and contractors across Ireland and the UK.