What is true regarding exit ramps from motorways?
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On the right is more common since it is safest (you naturally keep to the right on the road and avoid changing lanes when you intend to turn off). However: “Exit ramps from a motorway can sometimes be on the left.” (Du och jag i trafiken [You and me in traffic], 28th Edition, page 263).
Here is an example of an exit to the left: Google Maps, E4/E20 Solna
More examples of explanations: