Have you ever wondered what happens to traffic at a border between two countries that drive on opposite sides? The Lotus Bridge between mainland China and the former Portuguese colony of Macau was completed in 1999 and is a fantastically elaborate construction, featuring three lanes in each direction and dual bridges which loop around each other by 360Â° to swap the direction of the traffic. Amazing. There’s much more on this subject available on the rather good Wikipedia page about the rules of the road. Many thanks to Nicholas Hodder and Todd Day.