Service vehicles providing information (4,5)

I believe the answer is:

mass media

'providing information' is the definition.
(mass media provides information)

'service vehicles' is the wordplay.
'service' becomes 'mass' (I've seen this in other clues).
'vehicles' becomes 'media' (I've seen this before**).
'mass'+'media'='MASS MEDIA'

(Other definitions for mass media that I've seen before include "Communicators" , "Agencies of public information" , "Newspapers, radio, TV" , "Purveyors of news" , "Press, TV, etc" .)

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

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