Trade vehicles (7)

I believe the answer is:

traffic

I believe this clue is a double definition.

'trade' is the first definition.
(trafficking is a kind of trading)

'vehicles' is the second definition.
(I've seen this before)

(Other definitions for traffic that I've seen before include "Vehicles on the road" , "Illegal trading" , "Business" , "Truck" , "Vehicle flow" .)

I've seen this clue in The Guardian, The Globe and Mail and The Telegraph.

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