If you are referring to a freeway division (as in on the road),
the answer is "lane." (:
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On a freeway/highway, the lane which contains the diamond like
shape is a separate travel lane. Specifically this lane is
dedicated to the "ride share" and/or individuals carpooling.
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The question is a true statement.
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The fast lane is typically the leftmost lane on a multi-lane highway or freeway.