I'm Commodus. My reign ended the Pax Romana, the most peaceful period of the Roman Empire, but saw the completion of the Cloaca Maxima. Sewage systems and personalist deity cults are sexy.

It's true that the roundabouts in Carmel take up more land than traffic lights, and their design prioritizes cars first. The trade-offs are that they have fewer injury crashes and reduced emissions from cars idling at red lights. They should be designed for peds and bikes, like this Dutch one:

Glittering Imperial core? We've got the Pyramids, right here! And you know what else? We're holding an Imperial court, right at the Gainbridge Fieldhouse.

I still have a Knozone t-shirt from 2008!

Or bury the highways, Big Dig style (photo credit Andrew Haliburton).