Dagen H
| Date | September 3, 1967 |
|---|---|
| Time | 05:00 |
| Location | Sweden |
| Cause | Shift from left-hand to right-hand traffic |
| Outcome | Successful transition; initial decrease in accidents |
Dagen H (H-day), today usually called "Högertrafikomläggningen" (lit. 'the right-hand traffic reorganisation'), was on 3 September 1967, the day on which 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-hand traffic. It was by far the largest logistical event in Sweden's history.