CPV code 45221200 designates Construction work for tunnels, shafts and subways in the Common Procurement Vocabulary (CPV 2008), the EU classification used to describe the subject of public contracts.
45221200 sits under 45221000 (Construction work for bridges and tunnels, shafts and subways) and groups 5 more specific sub-codes. When classifying a tender, choose the narrowest code that still covers the full subject of the contract.