Services Provided
About the Project
St. Louis County, Missouri
The goal of the I-270 in North design-build project is to improve safety, mobility, and travel reliability throughout the I-270 corridor for all users. This community is heavily reliant on multi-modal travel, so it was important to the team to enhance walking, biking, and transit operations through the corridor.
CBB worked on the conceptual study for the project during the pursuit phase. The team created a design that eliminated all crossover slip ramps on the outer roads through a one-way outer road system, mitigated bottlenecks on the freeway through widening and innovative interchange designs, and enhanced pedestrian and bike facilities through implementation of a multi-use path. One key feature of our team’s proposal which set it apart from the competitor’s was the implementation of a counter-flow bus lane. Through the EA/FONSI process of the original preferred alternative, Metro expressed concerns on the negative impact to their operations with the conversion to one-way outer roads. To eliminate this issue for Metro while still maintaining the one-way outer road system necessary for optimized safety and local access through the corridor, our team is constructing a one-way counter flow bus lane from the Transit Center to West Florissant Road and the Florissant Valley Community College. The multi-use path will further enhance the multi-modal experience with dedicated facilities for all users and providing a safe space for transit riders to wait at bus stops, which are currently located in roadway shoulders. Our design provided the best mobility for both the local community and commuters travelling through the corridor. This proposal was selected as the winning design.
Post award, CBB was responsible for all safety evaluation and traffic modeling as well as the resubmission of the Access Justification Report to FHWA. CBB is responsible for the design of all traffic signals, overhead signage, freeway and arterial lighting, CCTV, Dynamic Message Boards (DMS), traffic detection equipment, and fiber/wireless communications for the project as well as for managing all traffic signal operations during construction. As one innovation CBB is operating a drone to observe traffic conditions during major construction events to provide better visibility on how traffic is moving in the corridor. As another, CBB is also developing a new Dynamic Trailblazer System which will be used by MoDOT’s TMC staff to manage the traffic in the corridor during incidents.
Learn more at: http://www.i270north.org/
