Overpasses must provide the required vertical clearance and often consider vehicle collision with piers or the superstructure. Installation usually needs a road closure, so lifting and splicing must be planned in detail.
Final member sizes, details and specifications are determined by the engineer of record for each project. This page describes general practice and does not replace project-specific engineering.
This content is general technical information. It does not replace project-specific structural design, which must be carried out or approved by a qualified engineer under the applicable codes and the requirements of the authority having jurisdiction.