Why Sweden Changed Driving Sides Overnight

Jan Collsiöö — Så var det. Public Domain.

September 3, 1967, was a big day for Sweden. Högertrafikomläggningen, or more simply, Dagen-H. It was the day the country switched from driving on the left to the right side of the road.

It was, predictably, absolute chaos, but the act of switching sides isn’t the most surprising part. It’s that the switch happened in 1967 when there were 1,976,248 registered vehicles Sweden. With that many…