Improving Traffic Flow and Safety Along Glenstone Avenue and US 60

The US 60 interchange at Glenstone Avenue in Springfield, MO, had become the site of an unusually high number of crashes over the years. The City of Springfield sought the expertise of CMT to identify the issues creating dangerous driving conditions and offer solutions to improve safety for motorists. The result was the award-winning $22.3 million US 60 & Glenstone Interchange Capacity and Safety Improvement project.

In-depth conceptual design discussions with the City and the Missouri Department of Transportation (MoDOT) ensured that the solution addressed all the stakeholders’ concerns and would accommodate the City’s future growth plans with minimal disruption. Improvements included a widened eight‐lane section from National Avenue to the US 60/65 Interchange and the consolidation of the Glenstone Avenue and Republic Road ramps to eastbound Route 60 at Harvard Avenue. The project also removed the existing eastbound on-ramp near Nature Center Way, widened westbound Route 60 off-ramp to Glenstone, and replaced the pavement on eastbound Route 60 between Glenstone and Route 65.

The project also reconfigured the existing interchange at Glenstone Avenue with a multi‐lane roundabout on the south leg of the interchange with an intersection at Nature Center Way/Republic Road, US 60.

All the improvements were made without requiring additional property. Maintenance of traffic included nighttime lane closings, narrowed lanes and traffic shifts, and temporary ramp closures. The entire fast-track design phase was completed in 12 months. A late change in the project schedule required an acceleration of final plans, and by harnessing the resources of all three of CMT’s Missouri offices, the final construction plans were delivered just 21 days after preliminary plan approval.