Abstract: Wow! And we thought Boston's Big Dig was a major undertaking. This 7-mile freeway tunnel through the heart of Nagoya is under construction in this photo, and really cool!
Abstract: Six-pointed ring junction.
Worst or Best? Voted the UK's second-worst roundabout in a 2005 poll held by an insurance company (the winner being its Swindon counterpart). In 2011 the roundabout was voted the best in Britain by motorists in a competition organized by a car leasing service.
Abstract: This site does not force left turns to occur on quadrant roadways, but the design is flexible, giving them a "get out of jail free" card when congestion is so bad that quadrants could improve things. Also improves general connectivity of this busy activity center.
Abstract: Southbound leg of Rio Mixcoac. This CFI also appears in a photograph that is widely circulated. The intersection has 5-legs, which must just be nasty. A 6th leg is visible, but has been barricaded to avoid total chaos.