Shrewsberry provided civil engineering design services on the $276M C-470 Express Lanes Design-Build project for the Colorado Department of Transportation. The project increased mobility and user choice along 12.5 miles of C-470 between I-25 and Wadsworth Boulevard. The project included 12 bridge widenings, two new bridges, new concrete pavements, auxiliary lanes, new communications infrastructure, noise walls, direct-connect ramps to major interstate highway, and new trail underpasses. The C-470 Express Lanes project added express lanes in addition to the existing four, free general-purpose lanes. This allows drivers to have a choice of using the free existing lanes or paying a toll to use the express lane. CDOT does not plan to have HOV/carpool lanes within the C-470 corridor.
The project was funded by $110.6M in combined state and federal funding and $10M from Douglas County. The balance was funded via a loan to be repaid by toll revenues from the use of express lanes by commuters.
Shrewsberry provided design support services for the design team. Duties included assigning ground mount signs per the Manual on Uniform Traffic Control Devices (MUTCD) and per the contract specifications, attended weekly coordination meeting with the Owner and design-build team, identified conflicts in the design plans, coordinated with Intelligent Transportation Systems (ITS) on details for the cross sections on overhead signs, calculated, verified, and confirmed foundation details per CDOT – S Standards for Overhead Sign Structures (Monotube) and Dynamic Sign Monotube Structures, and created detail sheets for the ground mount signs and x-sections of the overhead signs.