Highway sign
I believe the answer is:
merge
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">highway sign</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for merge that I've seen before include "Combine, blend" , "Join, blend" , "Come together as one" , "Combine elements" , "Join into one" .)