Public transport vehicles (5)
I believe the answer is:
buses
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">public transport vehicles</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for buses that I've seen before include "Public transport vehicles" , "Public service vehicles" , "Passenger vehicles" .)