| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| INTERNATIONAL ROAD ASSESSMENT PROGRAMME | 05476000 | 04/03/2019 | Gold |
| ROAD ASSESSMENT SERVICES LIMITED | 08070356 | 04/03/2019 | Silver |
| ROAD SAFETY FOUNDATION | 02069723 | 21/11/2017 | Silver |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| APPIA INFRASTRUCTURE SOLUTIONS LIMITED | 06653143 | 04/03/2013 | 31/10/2013 | Silver |
| APPIAN TRADING LIMITED | 04732120 | 09/10/2019 | 05/10/2022 | Silver |
| Advanced Systems Consultants Ltd | 01635807 | 01/01/2001 | 30/09/2001 | Dissolved |
| CFX LIMITED | 03524833 | 20/01/2000 | 25/09/2001 | Dissolved |
| CONNECTED PLACES CATAPULT | 11837978 | 01/04/2019 | 30/09/2020 | Bronze |
| GEMSERV LIMITED | 04419878 | 01/11/2020 | 23/01/2023 | Bronze |
| HR WALLINGFORD GROUP LIMITED | 01622174 | 16/10/2008 | 24/06/2019 | Silver |
| INSTITUTION OF HIGHWAYS AND TRANSPORTATION(THE) | 00252735 | 25/06/2008 | 06/09/2017 | Not Trading |
| Index Data Systems Ltd | 02401483 | 11/05/2000 | 25/05/2001 | Dissolved |
| LAND USE CONSULTANTS LIMITED | 02549296 | 24/09/2013 | 21/09/2021 | Silver |
| LAND USE CONSULTANTS TRUSTEE (EOT) LIMITED | 12349809 | 05/12/2019 | 21/09/2021 | Not Trading |
| MARINE AND GENERAL MUTUAL LIFE ASSURANCE SOCIETY | 00000006 | 03/07/2003 | 30/09/2009 | Dissolved |
| TRANSPORT RESEARCH FOUNDATION | 03011746 | 01/10/2001 | 31/10/2013 | Amber |
| TRANSPORT RESEARCH LABORATORY LIMITED | 03562621 | 01/10/2001 | 31/10/2013 | Not Trading |
| TRANSPORT SYSTEMS CATAPULT LIMITED | 08041919 | 29/05/2014 | 01/04/2019 | Dissolved |
| TRL ACADEMY | 03664805 | 01/10/2001 | 31/10/2013 | Not Trading |
| TRL LIMITED | 03142272 | 01/10/2001 | 31/10/2013 | Amber |