Modern highway construction frequently requires bridges with horizontally curved alignments. Such bridges can be created by superimposing a curved deck slab onto straight girders or by splicing segmental straight girders on the chords of a curved roadway. Of these two methods, a curved superstructure usually results in simpler construction and better appearance.
Amorn, Wilast; Tuan, Christopher Y.; and Tadros, Maher K., "Curved, Precast, Pretensioned Concrete I-Girder Bridges" (2008). Civil Engineering Faculty Publications. 3.