63712320 - Tunnel operation services

CPV code 63712320 in the EU Common Procurement Vocabulary refers to Tunnel operation services. It sits at level 6 of the CPV hierarchy as a subcategory within the 63 division. This code is nested directly under 63712300, narrowing the broader category into the specific area of tunnel operation services. As a leaf code, 63712320 has no further subdivisions and represents the most precise classification available in this branch — buyers should reference it directly in tender notices when the procurement primarily concerns tunnel operation services. Contracting authorities across the EU use 63712320 in TED notices and national procurement portals to signal that a tender relates to tunnel operation services.