Traffic constituents (5)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">traffic constituents</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for autos that I've seen before include "Religious dramas" , "Cars" , "Freeway traffic" .)