A possible explanation here might simply have to do with the amount of available paint in each colour
Valencia Best Posts in Thread: Road lines
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The lines are merely suggestions that everyone seems to ignore so, like you pointed out, it doesn't really matter. I just thought it looked bizarre, like x2 two lane roads that run parallel to each other with nothing splitting them.- Agree x 2
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2:15 of this LTO video. The picture doesn't exactly match the verbiage but I think this might be what your lines might be there to say.
- Informative x 2
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- Agree x 2