“Dagen H” (H Day) happened on 3 September 1967, the day that 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, and the most massive overhaul in driving infrastructure that the world had ever seen. This was the logo for that campaign. Read the full REMO Story HERE.