Links to other websites
- Colas SA (parent company of Colas Limited)
- Colas Isle of Man
- Colas Portsmouth PFI
- Colas Mechanical Services
- A-one (Highways Agency Area 14)
- SWH (Devon TMC)
- CECA (Civil Engineering Contractors Association
- HTMA (Highways Term Maintenance Association)
- ICE (Institution of Civil Engineers)
- IHT (Institution of Highways & Transportation)
- RSTA (Road Surface Treatments Association)
- TRL (Transport Research Laboratory)
- QPA (Quarry Products Association)