Civil engineering Standard Industrial Classification (SIC) codes of UK-based importers and exporters 42110 - Construction of roads and motorways (9157) 42120 - Construction of railways and underground railways (5739) 42130 - Construction of bridges and tunnels (1018) 42210 - Construction of utility projects for fluids (1486) 42220 - Construction of utility projects for electricity and telecommunications (7375) 42910 - Construction of water projects (2191) 42990 - Construction of other civil engineering projects n.e.c. (25902)