3rd September 1967: Traffic in Sweden switched from driving on the left to driving on the right “Dagen H (H day) was the day on which traffic in Sweden switched from driving on the left-hand side of the road to the right. The change was widely unpopular, The campaign included displaying the Dagen H logo on various commemorative items, including milk cartons, men’s shorts and women’s underwear. Swedish television held a contest for songs about the change; the winning entry was Håll dig till höger, Svensson (‘Keep to the right, Svensson’) by Rock-Boris.”