Cosgray Road Extension

ms consultants partnered with the City of Hilliard to extend Cosgray Road south, aligning it with Alton and Darby Creek Road to improve connectivity.

The project included:

• Three new roundabouts: a hybrid roundabout at Scioto Darby Road, and single-lane roundabouts at the entrance to The Well Recreation and Wellness Center and at Alton and Darby Creek Road.
• Shared-use paths for pedestrians and cyclists, connecting neighborhoods, parks, and retail areas.
• High-visibility crosswalks with medians and rapid flashing beacons for safe crossings.

This project improves roadway capacity for future growth and balances the needs of pedestrians and cyclists. A traffic study determined that the roundabout at Scioto Darby Road would result in over 70% fewer fatal and injury crashes than a traditional signalized intersection. The new design reduces travel speeds, shortens crosswalk distances, and eliminates the congestion-causing “dogleg” intersection, leading to fewer rear-end collisions and safer pedestrian crossings.

Key benefits include:

• Enhanced safety for all road users.
• Improved north-south connectivity.
• Direct access to The Well and over 20 new soccer fields.
• Increased walkability for residents and visitors.

The multilane hybrid roundabout at Scioto Darby Road, expected to serve over 30,000 vehicles per day, features lane spirals and dedicated exits that guide drivers safely, minimizing lane changes and crash risks. Raised crosswalks support pedestrian safety and traffic calming, while the design meets federal accessibility guidelines.

Project innovations:

• Simultaneous coordination with the design and construction of The Well campus and relocation of more than 20 soccer fields.
• Earthwork balancing and material reused for cost savings.
• Coordination with the fire department for efficient emergency access, including mountable medians.
• Collaboration with the Franklin County Engineer’s Office for sections outside city limits.
• Minimization of property impacts and expedited right-of-way acquisition.

Aesthetics played a significant role, as the area serves as a gateway to public spaces. Brick paver patterns and charcoaled-toned concrete create visually appealing roundabouts, while steel-backed timber guardrails integrate with the environment.

Other sustainable features include:

• Native flowers, grasses, and bushes for corridor beautification.
• Green stormwater treatment features, including vegetated bioretention cells.
• Drought-resistant landscaping to reduce maintenance.
• Intensive permitting to protect the Big Darby Creek Watershed.

The Cosgray Road Extension project has transformed the gateway to Hilliard’s wellness campus, improving traffic safety, reducing congestion, and enhancing pedestrian connectivity. The project supports a more walkable, accessible community and sets a new standard for sustainable infrastructure in the region.