'A roundabout revolution is slowly sweeping the US. The land of the car, where the stop sign and traffic light have ruled for decades, has started to embrace the free-flowing British circular. A few moments after entering Carmel, it's clear why the city has been described as the Milton Keynes of the US. As the sat-nav loudly and regularly points out, there's often a roundabout up ahead. But unlike in the English town famous for them, driving into this pretty city on the outskirts of Indianapolis also involves passing several more under construction. The city is at the forefront of...