Dagen H (H day), today usually called "Högertrafikomläggningen '' ("The right - hand traffic diversion ''), was the day on 3 September 1967, in which the traffic in Sweden switched from driving on the left - hand side of the road to the right. The "H '' stands for "Högertrafik '', the Swedish word for "right traffic ''. It was by far the largest logistical event in Sweden 's history.
what side of the road to drive in sweden
right - hand