Roadway Rehabilitation (Multi-Use Path)
EFK Moen designed Phase II final plans to add a new Interstate 70 south outer road and adapt the north outer road into a one-way outer road system to significantly alleviate traffic congestion and improve safety at the TR Hughes and Highway K interchanges in O’Fallon, Missouri.
The south outer road design included reconstruction of the drainage system, retaining walls, barrier and guardrail design and access accommodations for adjacent property. Converting the north outer road from a two-way road to a one-way road included alignment adjustments, side road intersection revisions, analysis and design of noise walls, Interstate ramp and entrance reconfiguration.
Modifications at the TR Hughes interchange included signal modifications and reconfiguration of the lanes to accommodate the one-way outer roads. Modifications at the Highway K interchange included a U-turn ramp to help traffic flow within the one-way outer road system, additional lanes on Highway K, access management to alleviate congestion through the retail corridor, traffic signal modifications, revised lighting and signing, ADA compliant sidewalks and aesthetic enhancements on the bridge, retaining walls and sidewalk.
EFK Moen coordinated plan development for the City of O’Fallon, Missouri, with MoDOT and FHWA through the Local Public Agency process including a Categorical Exclusion Environmental Clearance and an Access Justification Report for the Interstate ramp changes and the interchange modifications.
