Fundamentals

Swept path analysis is a software-based simulation that shows the exact path a vehicle's wheels and body take as it moves through a space. It demonstrates whether a vehicle can safely navigate a junction, access road, car park, or loading bay without mounting kerbs or colliding with obstacles. It is required on most planning applications involving vehicle access in the UK.

The National Planning Policy Framework (NPPF), revised 17 August 2026, sets the test in Policy TR6: development should only be refused on transport grounds where there would be an unacceptable impact on highway safety, or a severe adverse impact on the transport network. Demonstrating safe and suitable access is how you show neither applies. Local highway authorities use swept path drawings as evidence that the proposed access design will physically accommodate the vehicles expected to use it. Without SPA, a highway authority cannot confirm that a layout is safe, so they request it as a condition or reject the application outright.

A swept path drawing overlays the simulated vehicle movement path onto a site layout plan. It shows the vehicle's front and rear overhang, the tyre tracks of all axles, and the body outline at key points along the route. It typically includes a north point, scale bar, drawing reference, vehicle type used, and the software version. It is delivered as a PDF and usually a DWG CAD file.

Swept path analysis is produced by transport planning professionals, highway consultants, and specialist bureau services. It requires specialist software such as AutoTURN or AutoTrack and knowledge of UK vehicle standards, highway design guidance, and planning requirements. Small architectural practices and planning consultants typically outsource it because maintaining the software licence in-house is not cost-effective for occasional use.

The two main software packages used in the UK are AutoTURN by Transoft Solutions and AutoTrack by Savoy Computing. Both run within AutoCAD and use validated vehicle libraries based on UK standards. AutoTURN is the more widely used internationally; AutoTrack has a long history in the UK market. Both produce results acceptable to UK local highway authorities.

Both AutoTURN and AutoTrack perform swept path analysis using similar methodology but have different vehicle libraries and interfaces. AutoTrack was historically the dominant UK product and is still widely used by established transport consultancies. AutoTURN is owned by Transoft Solutions, is used globally, and tends to be the standard in new practices. Both are accepted by UK highway authorities. AutoTURN has broader international vehicle coverage, which matters for non-standard vehicles.

A simple swept path analysis for a residential access or single vehicle check takes 2–4 hours from receiving the CAD file and brief to delivering the finished drawing. A more complex multi-vehicle check for a commercial development with loading bays, refuse access, and emergency vehicle access might take 6–10 hours. Urgent jobs can be turned around in 4–6 hours with appropriate notice.

To commission a swept path analysis you need to provide a scaled site layout drawing in CAD format (DWG preferred) or a good quality scaled PDF, specify which vehicle types need to be checked, describe the manoeuvres required (entering, exiting, turning, reversing), and confirm the relevant planning authority so the correct highway standards can be applied. The more information you provide, the faster and more accurate the analysis.

Vehicle tracking and swept path analysis refer to the same process. Vehicle tracking is the term used in the AutoTURN software interface; swept path analysis is the more common planning and highway term. Some practitioners also use the term autotrack analysis referring to the AutoTrack software. They all describe the same simulation of vehicle movement paths through a space.

Swept path analysis is not specifically named in legislation but is effectively a practical requirement for any planning application involving vehicle access. NPPF Policy TR6 (revised 17 August 2026) means safe and suitable access has to be demonstrated, because an unacceptable impact on highway safety is a ground for refusal. The Design Manual for Roads and Bridges (DMRB) and Manual for Streets reference vehicle tracking as the appropriate method for assessing layouts. Local highway authorities routinely require it as a planning condition or pre-application requirement.

The National Planning Policy Framework (NPPF) is the government's planning policy guidance for England. Policy TR6 states that development should only be refused on transport grounds where there would be an unacceptable impact on highway safety, or where the residual cumulative impacts on the road network would be severe. Swept path analysis is the standard method used to demonstrate that proposed access arrangements are safe and suitable for the vehicles expected to use them.

The vehicles checked depend on the development type. Residential developments typically check private cars, refuse collection vehicles, and fire engines. Commercial developments add rigid lorries and articulated HGVs for delivery access. Care homes check ambulance access. Schools check coach access. Industrial sites check the largest delivery vehicles likely to use the site. Each vehicle type has specific dimensions and turning characteristics that must be accommodated.

No. Swept path analysis requires specialist software that runs within AutoCAD or as a standalone application. The software uses vehicle kinematic models to simulate realistic turning movements based on wheelbase, overhang, steering lock, and body dimensions. Manual estimation of swept paths is not acceptable to UK highway authorities for formal planning applications. However, indicative checks can be done using published geometric standards to sense-check a layout before commissioning formal analysis.

A design vehicle is the vehicle type that a layout is designed to accommodate. Choosing the correct design vehicle is critical because it determines whether the layout is safe and functional. Using a vehicle that is too small will produce a false pass — the layout might work for that vehicle but not for larger vehicles that will actually use the site. Using a vehicle that is too large will produce layouts that are unnecessarily costly or restrictive. The design vehicle should reflect the actual vehicles expected to use the site.

A swept path is the area swept by a vehicle as it completes a manoeuvre. On a drawing, it appears as two curved lines showing the outermost and innermost edges of the vehicle body, with the tyre tracks shown within those lines. The widest point of the swept path shows the maximum area the vehicle occupies during the turn. Obstacles, kerb lines, and other vehicles must be clear of this swept area for the manoeuvre to be safe and practical.

Key UK standards relevant to swept path analysis include the Design Manual for Roads and Bridges (DMRB), Manual for Streets (MfS), Manual for Streets 2, BS8300 for accessibility, local authority highway design guides, and the Highways England (now National Highways) standards for trunk road junctions. The appropriate standard depends on whether the access is onto a local road, a classified road, or a trunk road.

Not always, but increasingly yes. For simple single-dwelling driveways onto low-speed residential roads, formal swept path analysis may not be required. However, if the driveway involves a tight access, a corner close to a junction, an unusual vehicle requirement, or if the local highway authority has requested it, a swept path check will be needed. For driveways serving multiple dwellings or those onto busier roads, swept path analysis is almost always required.

A Construction Traffic Management Plan (CTMP) or Construction Logistics Plan (CLP) is a document that sets out how construction vehicle movements will be managed during a development. It typically includes routes for construction vehicles, timing restrictions, vehicle management arrangements, and swept path analysis for key manoeuvres such as deliveries, concrete pours, and waste removal. Local planning authorities routinely require swept path analysis as part of CLP submissions to demonstrate that large construction vehicles can safely access the site.

A transport assessment is a broad document assessing the traffic impact of a development on the surrounding road network. Swept path analysis is a specific technical drawing showing vehicle turning movements within a site layout. A transport assessment may include swept path drawings as one element of evidence, but they are distinct products. Small developments may only need swept path analysis; larger developments need both.

Yes. Swept path analysis is entirely desk-based and can be done from anywhere. The analyst needs a CAD file of the site layout, the brief specifying which vehicles and manoeuvres to check, and the relevant software. There is no requirement to visit the site to produce the drawings, though site visits may be useful for complex layouts to understand constraints that are not obvious from the plans.

A major planning application involves ten or more dwellings for residential development, or a commercial site of 0.5 hectares or more. Major applications receive more detailed scrutiny from the highway authority and almost always require swept path analysis. Minor applications may sometimes avoid it for simple access arrangements, but highway authorities increasingly request it even for minor applications where vehicle access is a constraint.

Modern swept path software such as AutoTURN uses kinematic vehicle models based on actual vehicle dimensions and steering geometry. The results are accurate representations of the theoretical swept path of the vehicle. In practice, real vehicles may sweep slightly less than the software predicts due to driver behaviour and speed effects, so software results are slightly conservative. Highway authorities accept this as appropriate for design purposes.

If a swept path analysis demonstrates that a vehicle cannot complete a required manoeuvre without mounting a kerb, entering oncoming traffic, or colliding with an obstacle, the layout needs to be redesigned. The swept path analysis is then rerun on the revised layout until the manoeuvre can be completed safely. This is why early-stage swept path checking is valuable — identifying problems before detailed design is locked in avoids costly changes later.

The cost of swept path analysis falls to the applicant or their consultant team. It is part of the technical preparation cost of a planning application, similar to a structural survey or a drainage report. The cost is typically included in the fees charged by an architect, planning consultant, or highway consultant as part of their overall service, or commissioned separately from a specialist bureau.

Across the UK market, costs vary by complexity: a simple residential access check typically costs £250–350, a standard planning application with one or two vehicle types £400–600, and a complex commercial or industrial development with multiple vehicle types and manoeuvres £600–1,500 or more. Some consultancies include it within broader transport or highway fees while specialist bureaux charge per drawing. For comparison, our own pricing separates the two: a standalone swept path drawing is a fixed £200 with discounts on bulk purchases and multiples, while a report, meaning a Construction Logistics Plan, Construction Traffic Management Plan or Construction Management Plan, starts at £1,400 and runs to £3,000 depending on scheme size and what the condition requires. A monthly retainer is available for practices submitting regularly.

A turning circle describes the diameter of the circle a vehicle traces when turning at full lock in an open space. A swept path analysis shows the actual path a vehicle takes through a constrained space such as an access road, junction, or car park. Turning circles are useful for initial feasibility checks; swept path analysis is the detailed technical verification used for planning submissions.

Yes, and it is strongly recommended. Pre-application swept path analysis allows designers to check whether the proposed layout will accommodate vehicles before the design is finalised. Identifying problems early avoids the frustration of receiving highway objections after submission, which can delay applications by months while redesign is carried out. Many planning consultants commission swept path checks as part of the pre-application process.

The local highway authority (LHA) reviews highway aspects of planning applications on behalf of the local planning authority. The LHA transport planner will assess the swept path drawings to confirm that the proposed access can accommodate the required vehicles to their satisfaction. They may request specific vehicles to be checked, specific manoeuvres to be demonstrated, or additional analysis if the initial submission does not satisfy their requirements.

A vehicle envelope is the outline of the vehicle body at any given point along its swept path. In a swept path drawing, the vehicle envelope is typically shown at the start, middle, and end of a manoeuvre to illustrate the vehicle's position relative to site boundaries, kerbs, and other obstacles at key moments. It helps reviewers understand not just where the tyres go but where the entire vehicle body is throughout the manoeuvre.

The methodology is the same across the UK but the specific vehicle standards, highway design guidance, and local requirements vary. England uses the NPPF and Manual for Streets. Scotland has the Designing Streets guidance. Wales has Planning Policy Wales and Technical Advice Notes. Northern Ireland has its own development management guidance. Additionally, individual local highway authorities may have specific design standards that supplement national guidance. An analyst needs to apply the correct standards for the local authority where the site is located.

Manual for Streets (MfS) is the primary guidance document for the design of residential streets in England and Wales. It replaced earlier prescriptive standards with a more flexible, context-sensitive approach. For swept path purposes, MfS specifies the design vehicles that residential streets should accommodate — primarily refuse vehicles and fire engines — and encourages designers to test layouts against these vehicles using swept path analysis rather than simply applying fixed geometric rules.

The Design Manual for Roads and Bridges (DMRB) is the UK standard for the design of trunk roads and motorways, produced by National Highways. It includes geometric standards, junction design guidance, and vehicle swept path requirements for high-speed roads. It applies primarily to trunk road junctions and does not replace Manual for Streets for local road design, though some local highway authorities reference DMRB standards in their local design guides.

A Construction Logistics Plan (CLP) is a document — formerly referred to as a CTMP — required on many major planning applications that sets out how construction vehicle movements will be safely managed. Swept path analysis is required within a CLP to demonstrate that the largest construction vehicles can safely access the site, navigate the site access, and complete deliveries without causing conflict with other road users. CLP Practitioners (CLOCS certified) produce these documents.

CLOCS stands for Construction Logistics and Community Safety. It is an industry standard for managing the safety of construction vehicle movements in and around building sites. CLP (Construction Logistics Planning) certification from CLOCS demonstrates competency in construction vehicle management and planning. CLP Practitioner certification (with registration number) is required for the preparation of Construction Logistics Plans on many major London and UK developments.

The process begins with receiving a CAD site layout and brief specifying the vehicles and manoeuvres to check. The analyst opens the layout in AutoTURN or AutoTrack and sets up the vehicle model from the software library. The vehicle is then driven through the manoeuvre using the software's simulation tools. The resulting swept path is assessed for clearances from kerbs, boundaries, and obstacles. If the manoeuvre fails, the layout is flagged for redesign. Once satisfactory, the drawing is annotated with vehicle type, scale, north point, and reference, exported as PDF and DWG, and delivered to the client.