What happens when a country's entire transport system switches from left-side driving to right-side driving? On Sept. 3, 1967, Sweden made that exact flip-flop--and file photos show just how confusing the process looked.
Prior to the change, Sweden was the lone northern European country that still drove on the left. De Standaard notes that other Scandinavian countries already drove on the right and that many cars sold in Sweden had steering wheels on the left. While the country had ruled in 1916 that cars should drive on the left, parliament only enforced the change beginning in 1967.