Motorway breakdowns get the attention, but most working vehicles break down on ordinary roads - the A-road lay-by, the industrial estate, the residential street at 5am. Highway Code Rules 275 to 278 cover what happens next, and they hand the driver a specific sequence that most have never been formally taught.
If you have to stop for a breakdown or incident, try to stop in a place of relative safety - somewhere you, your passengers and the vehicle are less likely to be hit by moving traffic. The ranking is explicit: a location designed for parking is safest; on high-speed roads a service area; then lay-bys, emergency areas and hard shoulders - with the pointed warning that hard shoulders offer less protection because they sit so close to fast traffic. The lesson for drivers is to act while the vehicle still has momentum: a van losing power on a dual carriageway can still reach the lay-by if the driver treats the first symptom as the decision point.
When the vehicle actually breaks down, the Code’s order of operations is:
The 45-metre triangle is the detail everyone half-remembers. It is also the detail that decides whether the approaching driver gets warning at speed or meets the van unannounced over the brow.
If the vehicle develops a problem, the first option is always to leave the carriageway at the next exit or reach a service area. When that fails, the Code’s structure is go left, get safe, get help: left lane, as far left as possible, wheels turned left, hazards on, out on the side furthest from traffic, behind the barrier if there is one - and stay away from the vehicle. DO NOT return to it even in the rain; DO NOT attempt repairs; DO NOT put a triangle on the carriageway. And the trapped-in-traffic case has its own rule: if you cannot reach relative safety or exit safely, stay in the vehicle, belts on, hazards on, and call 999 for the police.
The warning triangle sits at the junction of two rules and drivers routinely merge them. On ordinary roads Rule 276 wants the triangle out at least 45 metres behind the vehicle. On motorways - and by extension the fast parts of the network - Rule 277 forbids putting one on the carriageway at all. The logic is consistent: on a 30mph street the walk back with the triangle is survivable and the warning is valuable; beside 70mph traffic it is neither. Drivers should know which rule they are under before the breakdown happens, not while standing in the road with the triangle in one hand.
Passengers change the arithmetic too. Children kept under control away from the carriageway, animals kept in the vehicle or under control on the verge, nobody behind a safety barrier wandering back to the warm car - the Code is specific because roadside casualty reports are.
Every rule above has an equipment implication, and the cab of a working vehicle should answer all of them:
For fleet managers the point lands in the briefing, not the kit cupboard: drivers who have rehearsed “off the road, hazards, hi-vis, triangle 45 back, nobody behind the vehicle” do it in the dark on a wet A-road. Drivers who have only read it once do it halfway.