Traffic chaos in Sweden, 1967
We all hate standing in traffic, but the chaos depicted in this photo is something you don’t see everyday. It was taken in Stockholm, Sweden, in September 1967, and there’s a very simple explanation to this chaos. On this day, the country switched its driving lanes – from driving on the left-hand side of the road, to the right-hand side.
The country wanted to adjust itself to the neighboring countries, which have all made this change before them are were driving on the right lane. Clearly, it takes time adjusting to such a change, and so the confusion of people resulted in the chaos you see in the photo. It took another several days for people to adjust to the new driving rules.