Glossary
| OECD | Organization of Economic Co-operation and Development |
| OKSTRA | Object catalogue for roads and traffic |
| OPA | Porous asphalt |
| PAK | Polycyclic aromatic hydrocarbons |
| PCC | Portland Cement Concrete |
| PFF | Vehicle-pavement interaction facility |
| PIARC | Permanent International Association of Road Congresses |
| PMS | Pavement Management System |
| PROMETHEUS | Programme for a European Traffic with Highest Efficiency and Unprecedented Safety |
| QMS | Quality Management Systems |