On September 3, 1967, at 04.50 in the morning, the traffic everywhere in Sweden was directed over to the right side of the road and stopped. Everything stood absolutely still for 10 minutes, and at 05.00, when it started again, all road users in Sweden from heavy trucks to cyclists were already on the right side of the road, and they have stayed there since.

Dagen H
Pretty amazing. I had no idea Sweden changed sides of the road. 

12:23 AM → March 22nd 2008