Swept path analysis for refuse and emergency vehicles

Swept path analysis decides more layouts than any other piece of transport evidence, and on small schemes it is usually done last, which is why so many sites get redesigned. The vehicles that set the geometry are the refuse collection vehicle and the fire appliance. Neither is negotiable, both are large, and the dimensions come from the local authority rather than from a textbook.

Do the tracking at concept stage with the correct vehicles and the layout will survive consultation. Do it after the house types are fixed and you will be moving plots.

Which vehicles the layout has to accommodate

Four vehicles usually govern a residential layout. The refuse collection vehicle, the fire appliance, a removals or delivery vehicle, and a car in the visitor bay that will be parked exactly where you did not want it.

Refuse vehicle dimensions vary between authorities. Many waste services specify a three axle collection vehicle of roughly 11 to 12 metres in length, but the turning circle, overhang and axle spacing differ by fleet, and those are the parameters that matter for tracking. Ask the waste service for the dimensions of the vehicle they actually run, in writing, and put that reference on the drawing.

The fire appliance specification comes from Approved Document B. The typical pump appliance access route figures are a minimum road width between kerbs of 3.7 metres, a gateway width of 3.1 metres, a turning circle between kerbs of 16.8 metres and between walls of 19.2 metres, a clearance height of 3.7 metres and a carrying capacity of 12.5 tonnes. High reach appliances need more. Check the current Approved Document tables, because the figures are revised and the fire authority may ask for the larger appliance.

Emergency access is also about distance. Access for a pumping appliance should reach within 45 metres of all points within a house, and for a block of flats the appliance needs to get within 18 metres of the dry rising main inlet and within sight of the entrance it serves.

Getting the right inputs before you draw

Three phone calls save three redesigns. The waste service for the vehicle and the collection policy. The fire and rescue service for the appliance and any local supplement. The highway authority for adoption standards, because an adoptable street carries geometry requirements of its own.

Record the answers on the tracking drawing itself: vehicle name, overall length, width, wheelbase, minimum kerb to kerb turning radius, and the clearance envelope you have applied. A drawing without those figures cannot be checked, and a highway engineer who cannot check it will assume the worst.

Clearance envelopes are a convention rather than a rule. Half a metre to kerbs and a metre to walls, buildings and street furniture is the usual starting point. State what you used.

Turning heads, hammerheads and banjos

A dead end access route longer than 20 metres needs a turning facility under Approved Document B, and waste services normally want one wherever a collection vehicle would otherwise reverse.

A through route is the answer whenever the site allows it. It removes the turning head, removes the reversing argument, and gives both the refuse vehicle and the appliance a forward gear route in and out.

Where a hammerhead is used, check the arms with the actual vehicle rather than by scaling a standard detail. Arms that look generous on a 1:500 plan are frequently a metre short once the rear overhang is tracked.

Reversing, overrun and kerb treatments

Waste services resist reversing, and the health and safety guidance on workplace transport supports them: reversing is the manoeuvre most associated with injury, and a collection round that requires it on every visit will be refused.

Where a short reverse is unavoidable, expect the service to want a defined reversing point with clear visibility, no pedestrian conflict and a limited distance. Get that agreed in writing before the layout is fixed.

Overrun areas need designing rather than colouring in. If the tracking shows the rear wheels crossing a verge or a footway, that area has to be constructed to take the load, drained, and detailed so pedestrians are not walking in it. Mountable kerbs, a different surface material and a demarcation line all help. What does not help is a swept path that clips a private driveway or a front garden, because that is a manoeuvre the driver will not make.

Street trees deserve a specific check. Tracking is done in plan, and the conflict with a tree is in section: the body of a high sided vehicle passes above the kerb line and through the crown. Show the vertical envelope where trees, balconies or projecting bays are close to the carriageway.

Presenting the drawings so they get approved

Tracking drawings are read quickly by people looking for reasons to object. Make the answer obvious.

1. One manoeuvre per drawing or per clearly separated colour, with an arrow showing direction of travel.
2. Both the wheel path and the body swept path shown, with the body path being the one that matters for clearances.
3. Entry and exit tracked separately, in both directions where the route is two way.
4. All parking bays shown as occupied, including the visitor bays.
5. A key giving the vehicle parameters, the software used and the clearance applied.
6. The collection point, bin presentation area and fire appliance stopping position marked.

Add a short covering note explaining what the drawings show and where the vehicle dimensions came from. On a scheme where fire access is tight, the note should cross refer to the fire strategy so that the two documents agree. Our note on fire appliance access and hardstanding in a site layout covers the interaction in more detail.

The errors that force a redesign

The recurring five are worth checking before submission.

A turning head sized from a standard detail rather than tracked. A collection point placed beyond the drag distance the waste service allows, so the layout works for the vehicle and fails for the crew. Visitor parking positioned inside the swept envelope, which is fine on the drawing and impossible on the ground. A gateway or under croft with a clearance height below the appliance requirement. And tracking carried out with a car derived vehicle because the correct dimensions arrived late.

Where the scheme is large enough to need a transport assessment, the tracking drawings sit as appendices and the assessment text should explain the design vehicle choice. On smaller schemes the drawings often go in on their own, and then the covering note is doing all the work. Accessible parking interacts with this too, and the dimensions and positioning of accessible bays should be checked against the swept paths rather than after them.

This is general guidance, not legal advice. Check the position with your local planning authority or a qualified professional before relying on it.

To see which transport and highways documents your scheme is likely to need, enter the postcode on PlanScope. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.