 German |
 English |
|
|---|---|---|
Unterbau {m}; verbesserter Untergrund {m} (Straßenbau; Gleisbau) [constr.] ![[listen]](/pics/s1.png "Unterbau"){kind=small} |
subbase [Br.]; subgrade [Am.] (road building; track construction works) | |
| Gleisunterbau {m} | railway subbase [Br.]; railroad subgrade [Am.] | |
| Straßenunterbau {m} | road subbase layer [Br.]; road subbase [Br.]; road subgrade [Am.] |