CBB was a member of the Gateway Constructors team and contributed to many parts of the $535 million freeway reconstruction effort in St Louis. This project involved the closure and rebuilding of I-64, including pavement, bridges, and interchanges between Spoede Road and Kingshighway Boulevard, resulting in the diversion of approximately 100,000 vehicles per day onto adjacent highways and arterials.
A comprehensive traffic model was built for the twelve-mile section to evaluate the new interstate design including the reconstruction of eleven service interchanges and a major interstate connection at I-64 and I-170. Several interchange types were evaluated, including Single Point Urban Interchanges (SPUI), split-diamond interchanges (including CD roads), roundabout interchanges, and traditional diamond interchanges. All interchanges were evaluated with HCM methodologies, and the entire system was evaluated with VISSIM software. The model assisted the contractor team and MoDOT in selecting interchange concepts for each location and optimizing design details for each interchange.
CBB also participated in the development of the project’s maintenance of traffic (MOT) plan. The plan closed the west project end of I-64 (between Spoede and I-170) during 2008 and the east project end of I-64 (between I-170 and Kingshighway) in 2009. This plan shortened the duration of major regional traffic impacts from four years to two years.
One of CBB’s primary roles was to serve as the chief designer for all signals and highway lighting on the project. In this role, CBB coordinated design efforts involving new state signals and day-to-day operations between multiple consultants on the Gateway Constructors team along with MoDOT, St. Louis County, and the City of St Louis.
Additionally, CBB was responsible for all signal operations on the project corridor as well as four major “mitigation routes.” Effectively, the parent agencies turned over control of these signals, and CBB was solely responsible for the daily operation of approximately 200 MoDOT signals for the duration of the project. Signal timings were specifically developed for mitigation routes to accommodate the demands of traffic diverted by each construction stage. The signal timings were installed on-street and monitored daily with adjustments to accommodate traffic demand increases of 15-80% along the mitigation routes. As a result of CBB’s services, travel times along the mitigation routes were less than or comparable to pre-closure conditions despite the significant increases in traffic.
The project was awarded the 2010 America’s Best Transportation Project from the American Association of State Highway and Transportation Officials (AASHTO).
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12400 Olive Boulevard, Suite 430
St. Louis, MO 63141