I believe that it has to do with a one lane exit. Posting #2 has two pictures.
The left picture has the yellow markings at 12 o'clock and 6 o'clock. The exits right after that (at 3 o'clock and 9 o'clock) have a one lane exit. The picture on the right (without the yellow markings) has two lane exits at all four exit posts.
I think it forces traffic into the outer lane if you are planning on taking the one lane exits.
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