Advanced geometry

At one intersection the high groundwater elevation was estimated to be approximately 12 feet below the existing grade, so engineers were restricted to the depth they could lower the Keystone Parkway through lanes. Photos: American Structurepoint Inc.

By the end of the year, more than 60 roundabouts are expected to be opened to traffic throughout the 50 square miles of Carmel, Ind. Each will eventually have landscaping within medians and along the right of way.

Deploying a teardrop instead of a tight diamond design limited relocations to three homes and one business over a total of six at-grade intersection conversions.

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