The article talks about how bridges were built on the Lupoglav-Borut-Cerovlje road using precast prestressed concrete beams with partially cast in situ slabs. The biggest viaduct is 480 meters long. The design chosen in 1982 was precast prestressed u-beams connected with partially cast in situ reinforced concrete slabs, creating a twin box girder. They used new techniques like partial prestressing and omitting cross beams above supports. The article gives details on all six viaducts and the materials used for each bridge section.