It only appears to be the left lane that does this; right lane traffic always seems to merge over and exit the highway.
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traffic flying thru barrier nr Huesca ;[20/01/2018 11:40] (sec-0012+0011);-47535.3;95.5881;44516.6;0.524109;0.0249624
(game log is probably not needed here but it's at https://pastebin.com/mUH1JJmB if it is)