A rider was killed on an open road. The race starting today uses the same security model.

The men's Tour of Britain starts in Lincoln today, and it will be secured the same way as the race in which the Welsh rider Fin Tarling was killed last month: by rolling road closure.

A rolling closure is not a closed road. The route stays open to the public and is shut only in a moving bubble around the race convoy, opening again behind it. It is cheaper than a full closure, it needs far less from local authorities and police, and it is why road racing can be staged across public highways at all. Tarling died at the Volta a Portugal when he collided with a non-race vehicle travelling towards him. The police investigation is ongoing.

The gap is not theoretical

Days after that crash, at the women's Tour of Britain, the Australian rider Maeve Plouffe described riding into ordinary traffic while the race was still visibly in progress. "While the race convoy was still in sight, and I was less than two minutes down [behind], there were cars from the general public coming at me from all directions, including one that nearly hit me on a roundabout," she said.

Adam Hansen, president of the CPA riders' association, put it directly: "There is a hole in rolling road closures and we have to fix this."

The organisers of the Tour of Britain do not accept that their race is unsafe. Jonathan Day, a director of the organisation, said rider safety "is paramount and will always be treated as a priority in our planning and how we operate any race", and the organisation says the event is delivered in accordance with the UCI's road racing regulations — the standards that govern international and British road racing — with local authorities, emergency services, commissaires, police and event partners all inside the planning process.

Both positions can be true at once, and that is the uncomfortable part. A race can be run exactly to the sanctioning body's rulebook and still be exposed, if the rulebook permits a security model that depends on the public behaving predictably for the length of a stage.

Why this reaches past cycling

Every event that runs on a live public route makes some version of this trade. Full closure buys certainty and costs money, police time and civic patience; partial closure buys reach and affordability and imports risk from people who never agreed to be part of the event. Marathons, city races and grand tours all sit somewhere on that line, and it is normally settled quietly between an organiser and a local authority rather than in public.

It is not being settled quietly now. A season of serious crashes has pushed it into the open — among them the high-speed fall that forced Tadej Pogacar out of this year's Vuelta a España while he led the race, with the Vuelta still running until 13 September.

The timing carries a British edge. The Tour of Britain has grown from four days to five this year, matching the women's race, and its final stage on Sunday starts just south of Edinburgh — the site of the Grand Départ when the Tour de France opens in Britain next July. Whatever gets decided about rolling closures in the next ten months will be decided in the run-up to the largest race this country has hosted in years, and on the same roads.