- RAC
- RAC Foundation
- RAF (transport training department)
- Reading Borough Council
- Redcar & Cleveland Borough Council
- Rees Jeffreys Road Fund
- Rica (Research Institute for Consumer Affairs)
- RideSafe BackSafe
- Right To Ride
- Risk Solutions
- Road Safety Analysis /Agilysis
- Road Safety Authority
- Road Safety Foundation
- Road Safety GB
- Road Safety GB – North East
- Road Safety GB Academy
- Road Safety Markings Association (RSMA)
- Road Safety Scotland
- Road Safety Trust
- Road Safety Wales
- RoadPeace
- Roadsafe
- Rob Newton Associates
- Rochdale Casualty Reduction Team
- Rotherham Borough Council
- Routesafe Systems
- Rowan Public Affairs
- RoWSaF (Road Workers’ Safety Forum)
- Royal Borough of Kensington and Chelsea
- Royal Borough of Windsor and Maidenhead
- Royal HaskoningDHV
- Royal Society for the Prevention of Accidents (RoSPA)
- RSN Associates
- Rutland County Council
- Safer Essex Roads Partnership
- Safer Roads (Berkshire)
- Safer Roads Humber
- Safer Roads Partnership in West Mercia
- SafeSpeed
- Safety Cameras Scotland
- SafetyCube
- Salford City Council
- Sandwell MBC
- Savills (L&P) Ltd
- Scottish Borders Council
- Sefton Metropolitan Borough Council
- Sheffield City Council
- Shetland Islands Council
- Shiny Side Up Partnership
- Shropshire Council
- SignPost Solutions Limited
- Simulated Driving Solutions
- Sligo County Council
- Slough Borough Council
- Social Research Associates
- Solihull MBC
- Somerset County Council
- South Ayrshire Council
- South Eastern Education and Library Board
- South Gloucestershire Council
- South Lanarkshire Council
- South Manchester Assn of Driving Instructors
- South Tipperary County Council
- South Yorkshire Local Transport Plan (SYLTP) Central Team
- South Yorkshire Police
- South Yorkshire Safer Roads Partnership
- South Yorkshire Safety Cameras
- Southampton City Council
- Southend-on-Sea Borough Council
- Southern Education & Library Board
- St Helens Council
- Staffordshire County Council
- StarTraq (UK) Limited
- States of Jersey Police
- Steer Davies Gleave
- Stennik
- Stewart Paton Associates Ltd
- Stilwell Road Safety
- Stirling Council
- Stockport Council
- Stockton on Tees Borough Council
- Stoke on Trent City Council
- Strathclyde Safety Camera Partnership
- Student Road Safety Awards
- Studio Distract
- Suckling Transport Limited
- Suffolk Constabulary
- Suffolk County Council
- Sunderland City Council
- Surrey County Council
- Sussex Safer Roads Partnership
- Sustrans
- SWARWG
- Swindon Borough Council
- SWOV Institute for Road Safety Research
- T-Kartor G B Limited
- Tameside MBC
- Telford & Wrekin Council
- Thames Valley Police
- Thatcham Research
- The Bikeability Trust
- The Deer Initiative
- The North Review
- The Royal Borough of Windsor and Maidenhead
- The Stationery Office (TSO)
- The Transafe Network
- THINK! Norfolk Partnership
- Thurrock Council
- TISPOL (European Traffic Police Network)
- TMS CONSULTANCY
- Torbay Council
- Torfaen County Borough Council
- Trafford Council
- Transport Committee
- Transport Focus
- Transport for London
- Transport for Quality of Life
- Transport Safety Commission
- Transport Safety Research Centre, Loughborough University
- Transport Scotland
- Travelwest
- Tri-Coaching Partnership
- TRL
- Tyne and Wear, Local Transport Plan
- TyreSafe