Sweden changed the entire country from left-hand to right-hand driving in a single morning in 1967 because nearly all neighbouring countries already drove on the right and most Swedish cars had left-side steering, making overtaking on its old roads dangerously difficult.

On 3 September 1967, Sweden carried out a major traffic reform. In an operation named "Dagen H", the country changed traffic from the left side to the right side. Drivers woke up to a new traffic system, and the switch was completed in a few hours with little disruption. It took years of planning, massive campaigning of the population, and close cooperation of different government organisations, engineers, police, and people to carry out such an operation successfully.

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