AICHITECT Report: Top Traffic Related Consultants in London (2023–2025)
Using decisions from 2023 to 2025 across all London planning authorities, we ranked organisations most often associated with clean outcomes on transport/traffic inputs (transport assessments, travel plans, parking/servicing access, construction logistics, junction modelling, highways design).
Success means the consultant wasn’t called out as a reason for refusal; failure means they were explicitly blamed in the decision. We apply a Wilson 95% lower-bound “success” score to reward sustained clean performance and down-weight tiny samples. We also filtered out local authorities/statutory consultees, public bodies, and non-consultant suppliers, then deduped near-duplicate names.
The honorees were involved in multiple transport-related applications per year in our sample, with consistently strong performance.
The Honourees
Steer
Global mobility & transport specialists delivering strategy, planning, and modelling for development and cities.Caneparo Associates
Central-London, independent transport planning & highways design consultancy focused on development planning.Motion
Transport, travel planning, and infrastructure design consultancy supporting schemes from small housing to large mixed-use.Ove Arup & Partners (Arup)
Multidisciplinary engineers with a dedicated transport consulting practice spanning strategy, planning, and delivery.Paul Mew Associates
London-founded (1996) development transport planning & traffic engineering consultants for private/public clients.Pell Frischmann
Long-standing transport planning and highways capability across buildings, land development, and infrastructure sectors.Momentum Transport Consultancy
Urban transport & movement consultancy working across development planning and public realm.
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Former independent transport planning firm acquired by SLR; the team now sits within SLR’s mobility/transport practice.
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Specialist independent transport planning consultancy serving the development sector.
YES Engineering Group (YES Transport)
Transport planning & Construction Logistics Plan (CLP) specialists supporting development and neighborhood groups.
Why this matters right now
London schemes routinely hinge on transport/traffic evidence: transport assessments, junction capacity, parking/servicing strategy, travel planning and CLPs. Picking teams with clean planning track-records reduces risk and iteration in pre-app and determination.
Methodology
Scope: 2023–2025 decisions across all London planning authorities where transport/traffic-adjacent documents were present (transport assessments/statements, travel plans, parking/servicing access, highways/junction design, CLPs).
Success vs failure: Failure counted only when the decision explicitly blamed a consultant for refusal; otherwise it counted as success.
Ranking: We applied the Wilson 95% lower-bound of success rate (confidence-aware), then used the dataset’s composite/rank fields to order ties. A perfect 2/2 won’t outrank a consistent 9/9.
Data hygiene: Excluded local authorities/statutory consultees (e.g., TfL, borough “Highways/Transport” departments/teams), public bodies and obvious suppliers; deduplicated near-duplicate names (legal suffix and punctuation variants).
Notes & disclaimer
This report focuses on planning-context performance for traffic/transport inputs (not engineering construction delivery). Inclusion recognizes shored-up performance in our sample, not a marketing claim of single-discipline scope on any one scheme. We received no payment from any firm listed; websites are included for attribution. As with any dataset, omissions and classification errors may occur despite best efforts.
