MTJ Roundabout Engineering provided roundabout capacity analysis, design alternative development, and final horizontal design for this intersection for the City of Dublin as a sub-consultant to GPD Group.

Some of the main requirements of the project included high approach speeds, ROW constraints, and large truck considerations.

MTJ prepared two design alternatives, each with differing impacts. Both alternatives were designed to achieve the necessary capacity and LOS for the proposed roundabout while adhering to foundational safety principles.

The 125′ ICD alternative was selected and included an EB auxiliary RT lane separated from the through lane with a median island to maintain fewer impacts, allowing for the smaller size and reduced effects.