[drallison]

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.

[nemetroid]

> 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...

[jacobush]

Thank you! Finally I get an explanation why in my youth some roads had yellow markings. I always thought the yellow markings was prettier.