Which bridge construction method is a modern version of cast-in-place congenitally reinforced concrete?

The correct answer is based on the understanding of modern construction methods in bridge engineering. The precast prestressed slab is considered a modern counterpart to cast-in-place congenitally reinforced concrete because it incorporates the principles of prestressing, which enhances the structural capacity and flexibility of the concrete component.

In precast prestressed concrete, the elements are cast in a controlled environment and are subjected to prestressing techniques before being transported to the site for assembly. This method offers significant advantages, such as reduced construction time on site, improved quality control, and the ability to create longer spans with reduced deflection and crack control.

Cast-in-place congenitally reinforced concrete typically involves pouring concrete directly at the construction site, which is a more traditional method. The advancements and efficiency of the precast method combined with prestressing techniques provide innovations that align with modern engineering practices. This makes precast prestressed slabs a more contemporary approach while still fulfilling similar roles to traditional cast-in-place methods.

Other options, while important in bridge design, do not fit the criteria of being a direct modern version of cast-in-place congenitally reinforced concrete. Box girders, composite steel-concrete beams, and steel trusses represent different structural systems with their own specific advantages and applications, distinct from