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Re:Dagen H: The Day Sweden Switched Traffic Sides by drallison on Friday April 12, 2019 @12:23AM (#19641959)
I was in Sweden on the day they changed over. It was carefully planned. All of the signage was switched over night--old signs removed or covered and new ones revealed. I don't remember what was done for lane markings. Drivers had been practicing for months. Right-hand drive cars persisted for a while. Everything went surprisingly smoothly.
Re:Dagen H: The Day Sweden Switched Traffic Sides by nemetroid on Friday April 12, 2019 @07:18AM (#19643777)
> I don't remember what was done for lane markings.

The Swedish Wikipedia article[0] mentions this. In conjunction with the change-over, lane markings went from yellow to white. This article doesn't mention it, but I recall reading that some roads had both colours during the transition.

0: https://sv.wikipedia.org/wiki/H%C3%B6gertrafikoml%C3%A4ggnin...

Re:Dagen H: The Day Sweden Switched Traffic Sides by jacobush on Friday April 12, 2019 @08:22AM (#19644134)
Thank you! Finally I get an explanation why in my youth some roads had yellow markings. I always thought the yellow markings was prettier.