Abstract
Transportation facilities in most major urban areas in the united states are operating far beyond their design capacities. Extensiverehabilitation, renovation and new construction is required if we hope to meet our future needs. The challenge facing the engineering community is to develop techniques to provide increased capacity, improved safety, at reasonable cost, while minimizing the impact on theoperation of the current facility. Second level bridges built with precast segmental construction provide one important solution to this challenge. This paper appears in transportation research record no. 1290, Third bridge engineering conference, march 10-13, 1991, denver, colorado, volume 2.