Side-by-side box-beam bridges also known as "adjacent box-beam bridges" became popular because of construction and under clearance advantages. In fact, side-by-side box-beam is the bridge superstructure of choice for short and short to medium span bridges. Another significant advantage of this bridge type is that construction is rapid and traffic can be maintained below without interruptions. The side-by-side box-beam bridges are constructed with different design configurations in different states in the US and other countries. In Michigan, it is constructed by placing precast and prestressed box-beams adjacent to each other, mortar grouting full-depth shear keys, applying transverse post-tensioning, and casting a 150 mm single layer reinforced concrete deck.