CPV code 45230000 designates Construction work for pipelines, communication and power lines, for highways, roads, airfields and railways; flatwork in the Common Procurement Vocabulary (CPV 2008), the EU classification used to describe the subject of public contracts.
45230000 sits under 45200000 (Works for complete or part construction and civil engineering work) and groups 7 more specific sub-codes. When classifying a tender, choose the narrowest code that still covers the full subject of the contract.