The '70s were also a transitional period in bridge design where truss bridges were being phased out in favour of newer types of hybrid suspension bridge. Many o

The '70s were also a transitional period in bridge design where truss bridges were being phased out in favour of newer types of hybrid suspension bridge. Many of the iron and steel bridges of the 1890s through the 1970s were later replaced with suspension bridges or arch span bridges because they used less material and could be architecturally adapted to the area better. So some truss bridges were made as much for appearance as function in order to compete with the futuristic hybrid suspension bridges like the 1967 Ponte Morandi or the 1987 replacement Sunshine Skyway.