Crossword Genius

Speed limit letters (3)

Ross

I believe the answer is:

mph

'speed limit letters' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for mph that I've seen before include "Speed (abbreviation)" , "Miles per hour (abbrev.)" .)

I've seen this clue in the USA Today, the Family Time and the Newsday.com.
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