I-90 | Pennsylvania

Before rehabilitating 18 miles of Interstate Highway 90 in northwestern PA, PennDOT Engineering District 1-0 hired Transtec through GAI Consultants to provide a feasibility study and various alternative rehabilitation options. Though the district originally intended to repair the pavement with a “crack and seat” method, one of Transtec’s alternative designs—rubblizing the existing pavement—became the final design. Transtec’s proposal saved the district millions of dollars and was more appropriate for local materials.

CLIENT: PennDOT Engineering District 1-0

Transtec designed an alternative rehabilitation option for I-90, saving the district $10 million in initial cost. The life cycle cost analysis proved that this alternative rubblization scenario was the most cost effective over the life of the 40-year analysis period. Furthermore, Transtec’s asphalt design was the most sound to implement due to its consideration of soil liquefaction conditions in the area.