The Combined Nomenclature (CN), v1:2018
8530: Electrical signalling, safety or traffic control equipment for railways, tramways, roads, inland waterways, parking facilities, port installations
https://www.dst.dk/en/Statistik/dokumentation/nomenklaturer/kn?id=97dd4f6e-1b47-43b5-8532-380d3d1b7c2f