Answer: He is a policeman, standing on a traffic island.
I love wordplay. Let it be known to the world. I especially take interest in puns, double entendres, malapropisms... But any type of word bending really tickles my fancy. In fact, many puzzles are predicated on multiple meanings and ambivalent word usage. Observe:
A man marries twenty women in his village but isn't charged with polygamy. Why not?
Hint: Title of this post. It's a double entendre!