Keystone Parkway is the Greenest Highway Intersection in US

Carmel, Indiana has built a double teardrop roundabout that could very well be the greenest highway intersection in the United States. It’s a compelling solution to the various challenges the city faced when they needed a major upgrade to one of their busiest intersections, but lacked the money and the space. The unique solution has saved many buildings, reduced accidents dramatically, reduces carbon emissions and is much more pedestrian friendly