| 42.1 | CONSTRUCTION OF ROADS AND RAILWAYS |
| Class | The name of the class |
| 42.11 | Construction of roads and motorways |
| 42.12 | Construction of railways and underground railways |
| 42.13 | Construction of bridges and tunnels |
| 42.2 | CONSTRUCTION OF UTILITY PROJECTS |
| Class | The name of the class |
| 42.21 | Construction of utility projects for fluids |
| 42.22 | Construction of utility projects for electricity and telecommunications |
| 42.9 | CONSTRUCTION OF OTHER CIVIL ENGINEERING PROJECTS |
| Class | The name of the class |
| 42.91 | Construction of water projects |
| 42.99 | Construction of other civil engineering projects n.e.c. |