| Road class | Syntax explanation |
|---|---|
| European road | E-[0-9]<2-3> |
| Motorway (Autopista) | AP-[0-9]<1-2> |
| Expressway (Autovía) | A-[0-9]<1-2> |
| Radial motorway | R[1-5] |
| National road (Carretera Nacional) | N-`Roman`{a};N-[0-9]<3>{a} |
| Regional road (Carretera Comarcal) | C-[0-9]<3-4>{a} |
| Community road | see region table |
