Quick Facts

The standard UK refuse collection vehicle is approximately 2.5 metres wide. This width governs the clear width needed for the vehicle to pass through a gate or between obstacles. Any access designed for refuse vehicles must provide adequate clearance on both sides of this width for safe operation.

The minimum aisle width for perpendicular parking bays for a standard car is typically 6 metres, allowing a car to manoeuvre into and out of the bay in a single movement. Narrower aisles require more than one movement to park or exit, which is generally unacceptable for public car parks. Confirm with the local authority's design guide.

Most UK highway authorities limit refuse vehicle reversing to 12 metres from the public road. Beyond this distance, the safety risk to pedestrians and the operational difficulty for the driver become unacceptable. Cul-de-sacs longer than 12 metres should have a turning area to allow the refuse vehicle to turn rather than reverse.

Approved Document B requires that a fire appliance can approach within 45 metres of any part of a building that requires fire service access. The 45 metres is measured along the access route, not as a straight-line distance. Swept path analysis demonstrates that the fire engine can navigate the access route to within 45 metres of the building.

The standard maximum length for an articulated lorry in the UK is 16.5 metres including tractor and trailer. Longer semi-trailers of up to 18.75 metres operate under special authorisation on specific routes. The design lorry for commercial access analysis is typically 16.5 metres unless the specific operation requires LST.

A turning head is an area at the end of a cul-de-sac or access road that allows vehicles to turn. The dimensions depend on the design vehicle. A hammerhead for a standard refuse vehicle (10.5 metres) typically requires arm dimensions of approximately 4 metres wide and 12 metres long. Always confirm with swept path analysis rather than relying on standard tables.

There is no published national figure, but any planning application involving new or altered vehicle access is likely to trigger a swept path requirement. This includes the majority of residential, commercial, and industrial applications. Conservative estimates suggest swept path analysis is required on 40–60% of all planning applications decided by English planning authorities.

A standard 10-metre refuse vehicle has a kerb-to-kerb turning circle of approximately 21–23 metres depending on the specific model. This is the diameter of the circle it can trace at full lock in an open space. Turning areas and road radii must be generous enough to accommodate this turning circle.

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Rear overhang is the distance from the rear axle to the back of the vehicle. On a turn, the rear of the vehicle swings outward — away from the direction of the turn. This outswing can strike obstacles that are clear of the tyre tracks. A vehicle turning left into a tight access can have its rear right corner swing into oncoming traffic on the road it is leaving.

Front overhang is the distance from the front axle to the front of the vehicle. On a tight turn, the front of the vehicle cuts in toward the inside of the turn. This front overhang cut-in can strike the kerb, a pedestrian, or a gate post on the inside of a turn. Always check both front and rear overhang in swept path analysis.

Approximately 350,000–370,000 planning applications are received by district-level planning authorities in England each year. A significant proportion involve vehicle access changes that require swept path analysis. This represents a structural, recurring demand for SPA services that does not diminish regardless of market conditions.

A ghost island is a right-turn lane on an A or B road created by road markings rather than physical kerbs. The ghost island provides a waiting area for right-turning vehicles without requiring full carriageway widening. Swept path analysis determines the correct taper, width, and length of the ghost island to accommodate the design vehicle completing a right turn without conflicting with traffic.

A shared driveway serving two houses should be wide enough to accommodate passing — typically a minimum of 4.5 metres at the access from the road, widening to a turning head or passing place further in. The swept path of the design vehicles — typically cars — determines the minimum passing widths. Confirm with the local highway authority design guide.

A bin collection point is the place where residents leave their bins for collection by the refuse vehicle. Its position is determined partly by swept path analysis — the RCV must be able to approach within 25 metres without needing to enter private land. Bin collection points that are too far from the public road or inaccessible to the RCV create collection problems that councils are slow to resolve after development is complete.

Most UK highway authorities accept results from both AutoTURN and AutoTrack. Neither software is mandated by national policy. Some authorities have a longstanding preference for one over the other based on their in-house toolset. In practice, the vehicle and clearances in the drawing are what authorities review — not the software brand.

Outswing is the movement of the rear of a vehicle away from the centre of a turn as it steers. At an access gate, a vehicle entering from a public road makes a turn into the site. The rear of the vehicle swings toward the road as the front enters the gate. If the gate posts are too close to the road edge, the rear outswing will clip the gate post. This is a very common swept path failure at gated developments.

A standard fire engine is approximately 2.5 metres wide. To provide adequate clearance for a fire engine to pass through a gate without the driver needing to stop and realign, the gate opening should be a minimum of 3.1 metres clear. Many gated residential developments have gates too narrow for fire engines — a problem discovered during an emergency rather than during design.

The CLOCS Standard is maintained and updated by the CLOCS Programme. Check the CLOCS website at clocs.org.uk for the current version. CLP Practitioners with CLOCS registration should ensure they are familiar with the current version of the standard, as requirements may be updated periodically. Certification remains valid for five years from the date of issue.

A standard residential swept path drawing costs £250–500. A complex commercial analysis costs £600–1,500. Against a planning delay of weeks or months — which can cost tens of thousands in holding, financing, and professional costs — the swept path fee is negligible. For any development with vehicle access, swept path analysis is one of the highest return investments in the planning process.

A large mixed-use development may need to check five to eight vehicle types: private cars, refuse vehicles for residential use, refuse vehicles for commercial use, service lorries, emergency vehicles, coaches, delivery vans, and potentially abnormal loads. Each vehicle type has different swept path characteristics and may require separate analysis for different areas of the site.

The maximum gradient for an adoptable residential access road is typically 10% for short distances. Access ramps can be steeper — up to 15–20% in some authority guidance — but must include flat transition sections at the top and bottom to prevent vehicles grounding. Steep gradients also affect vehicle speed and control, which must be considered alongside the swept path geometry.

A kerb radius is the curved section of kerb at a road junction or access. A larger kerb radius allows vehicles to turn more easily. A smaller radius forces vehicles into tighter turns that may exceed their swept path capability. The swept path analysis determines the minimum kerb radius needed for the design vehicle to navigate the junction without mounting the kerb.

Under the NPPF revised 17 August 2026, Policy TR6 says development should only be refused where there would be an unacceptable impact on highway safety, or a severe adverse impact on the transport network. It also requires that the design of streets prioritises the needs of people over vehicles. For highway authorities, this paragraph is the basis for requesting swept path analysis — it is the policy requirement that access be demonstrably safe and suitable.

On a narrow access lane where vehicles cannot pass simultaneously, passing places should be spaced at intervals that allow drivers to see another vehicle approaching and pull into a passing place before meeting. The spacing depends on visibility — on a straight lane with good visibility, spacing of 100–150 metres is typical. Swept path analysis confirms that the passing place dimensions are adequate for two vehicles to pass.

A dropped kerb is a section of kerb lowered to kerb-flush level to allow vehicles to cross the footway from the road to a driveway. The dropped kerb position and the driveway width together create the vehicle access. Swept path analysis for a dropped kerb access confirms that the design vehicle can turn from the road onto the driveway without mounting the adjacent standard kerb or encroaching on the footway.

A bell mouth is a flared access junction where the verge or footway is set back to create a wider entry to the site access. The bell mouth geometry — the flare radius and dimensions — is determined by the swept path of the design vehicle entering and exiting. Without swept path analysis, bell mouth dimensions are typically estimated using standard tables that may not match the actual vehicle.

Vehicle length, vehicle width, wheelbase, front overhang, and rear overhang. These five dimensions, together with the maximum steering angle, determine the swept path of any vehicle on any manoeuvre. Understanding how these numbers interact with each other and with the site geometry is the foundation of competent swept path analysis.

A parking survey counts how many vehicles are parked in an area and when, measuring demand and capacity. Swept path analysis checks whether vehicles can physically manoeuvre in a space. They are completely different tools that address completely different questions. Both may be required for a planning application with parking implications — but they should not be confused.

A compound turn is one where the vehicle must complete more than one turning movement in sequence — for example, turning right from a road into a side access, then immediately turning left into a docking bay. The swept path of each movement must be checked, and the cumulative space needed for the sequence must be confirmed within the available geometry.

A free-flowing junction is one where vehicles do not need to stop or queue — typically a large roundabout or motorway slip road where traffic flows continuously. At free-flowing junctions, swept path analysis focuses on the geometry of the curve rather than stopping manoeuvres. This simplifies the analysis compared to junctions where vehicles must stop and restart from various positions.

A compact roundabout is a roundabout with a central island between 4 and 28 metres in diameter. The swept path analysis confirms that vehicles can enter, circulate, and exit without mounting the kerb or crossing into opposing lanes. Larger vehicles may need to mount the kerb of the central island on entry — this is acceptable for compact roundabouts but must be shown in the swept path analysis.

A splitter island separates lanes at a junction, channelling vehicles into the correct approach. The swept path of vehicles turning around a splitter island determines its minimum dimensions. If the island is too large, vehicles cannot turn without mounting it. If it is too small, it provides inadequate channelling. Swept path analysis determines the optimal island dimensions.

An acceleration lane allows vehicles joining a main road from a slip road to accelerate to traffic speed before merging. Swept path analysis at the junction between the slip road and the acceleration lane confirms that vehicles can navigate the transition smoothly without conflict. The swept path of large vehicles at the slip road nose is the critical check.

A deceleration lane allows vehicles leaving a main road to reduce speed before reaching the junction without impeding main road traffic. The swept path of the design vehicle from the main road carriageway into the deceleration lane governs the taper length and width of the lane. Swept path analysis ensures the geometry is comfortable for the design vehicle.

A traffic island directs vehicle movements, provides pedestrian refuge, and controls traffic speeds. Its size and position are determined in part by the swept path of the largest vehicle that must navigate around it. An island that is too large blocks vehicle movements; one that is too small fails to channel traffic effectively. The swept path analysis identifies the optimal size.

An at-grade crossing is a crossing where road vehicles and another mode — pedestrians, cyclists, or railway — cross at the same level without a bridge or underpass. Swept path analysis at at-grade crossings confirms that the crossing geometry is adequate for vehicles and that swept paths do not encroach on the crossing area used by other road users.

A vehicle crossover is the point where a vehicle crosses the footway to access a driveway or private road. Swept path analysis is needed where the crossover involves a turn, where the footway width is constrained, or where sight lines at the crossing are limited. A straightforward crossover onto a wide, low-speed road typically needs only a geometric check against standard dimensions.

The minimum forward visibility depends on the vehicle speed on the approach. Manual for Streets specifies forward visibility based on speed. At 30mph, forward visibility of approximately 70 metres is required. At 60mph on a trunk road, much greater distances are needed. The swept path analysis and visibility check are complementary — one addresses geometry, the other addresses sight distance.

A vehicle activated sign is a speed warning sign that activates when a vehicle exceeds a trigger speed. It does not directly affect swept path analysis, but the position of the sign's sensor and display must be clear of vehicle swept paths, particularly for large vehicles whose mirrors or bodywork might trigger or obstruct the sign.

Lane dividers separate traffic lanes and guide vehicles. The swept path of large vehicles at lane dividers confirms that the lane widths are adequate — that a lorry in one lane does not encroach on an adjacent lane during normal travel. On tight roundabouts and junctions, lane dividers that are too close to the carriageway edge can be struck by large vehicles' mirrors or bodywork.

An emergency access route provides secondary access to a development for emergency vehicles when the primary access is blocked. Swept path analysis confirms that the emergency route can accommodate the design emergency vehicle — typically a fire engine. Emergency routes through pedestrian areas or cycle paths must be passable for the fire engine while minimising the intrusion on the pedestrian and cycle environment.

A road closure order permanently or temporarily closes a section of road. If the closure affects a development access, the swept path analysis must be updated to reflect the changed road layout. An access that previously benefited from the closed road for vehicle manoeuvres may fail once the road is closed and that space is no longer available.

A traffic regulation order (TRO) creates, modifies, or removes parking restrictions, turn prohibitions, or other traffic management measures. A TRO that introduces a no-right-turn order at a junction changes the vehicle movements that need to be swept path checked. Similarly, a parking restriction that removes kerbside parking may change the effective carriageway width available for swept paths.

Future-proofing means checking the swept path against the vehicle types expected to use the access in the future, not just those used today. If the operator plans to upgrade to larger vehicles, the swept path analysis should use the larger vehicle dimensions. If a road network is designed for current traffic volumes, checking a larger vehicle ensures the design will still work as volumes and vehicle sizes increase.

A care home may have oil-fired heating requiring periodic tanker deliveries. The swept path analysis checks that the delivery tanker can access the fill point, manoeuvre to position, and exit safely. If the care home has restricted access — a narrow driveway or tight gates — the fuel delivery tanker swept path may be one of the most demanding checks on the site.

A low-emission zone restricts access to high-emission vehicles. This changes the vehicle mix using the roads within the zone. Swept path analysis for access into a low-emission zone should consider the clean vehicle types that will be used instead of conventional vehicles. Electric HGVs may have slightly different dimensional characteristics from diesel equivalents.

A parking accumulation survey records the number of vehicles parked in an area at intervals throughout the day, identifying peak parking demand. Swept path analysis checks whether those vehicles can manoeuvre safely in the parking area. They are complementary — one measures demand, the other confirms the physical layout can accommodate it.

A track geometry survey measures the precise width, radius, and gradient of an existing road. It provides the input data for swept path analysis of that road — without accurate geometry data, the swept path analysis cannot be accurate. For swept path analysis of existing roads, a track geometry survey or topographic survey of the road is the necessary starting point.

A ground-mounted solar array requires maintenance vehicle access between panel rows. The swept path confirms that the maintenance vehicle — typically a van or small lorry — can navigate the internal access tracks between panels, including turning at the ends of rows. Panels positioned within the swept path will be struck during maintenance operations.