- i2i Motorcycle Academy
- IAM RoadSmart
- ICE Scotland
- Ideas4ADIs Ltd
- Ignition Risk Management Ltd
- Imperial College London (Centre for Transport Studies)
- Independent Transport Commission
- Inspira Cumbria Limited
- Institute of Highway Engineers
- Institute of transport and traffic safety
- Interactive Driving Systems
- International Solutions 4 Safer Driving
- IRSO
- Isle of Anglesey County Council
- Isle of Wight Council
- Jacobs
- JM Safety Training Limited
- Kent & Medway Safety Camera Partnership
- Kent County Council
- Kildare County Council
- King Scientific
- Kirklees Council
- Klaruw RMS Ltd
- Knowsley Metropolitan Borough Council
