Precast I-girders, of the type now widely used for spans up to the l20-ft. range, will not be adequate for these longer spans. It was proposed in Ref. 48 that AASHO Type VI I-girders might be used for simple spans up to 140 ft. and continuous spans up to 160 ft. (where precast lengths of 80 ft. are joined together by splicing.) To obtain greater spans than this the use of haunched sections or inclined piers was also proposed.