traffic cop

noun Informal.
a police officer who directs the flow of traffic, usually at an intersection.

Origin:
1910–15, Americanism

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World English Dictionary
traffic cop
 
n
informal a policeman who supervises road traffic

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
The role of the professor now is part party host, part traffic cop, full-time
  enabler.
Not that you've ever had to think about it, but somebody has to play traffic
  cop in space.
No traffic cop whistled them off the hidden rock in the next rapids.
For me the best method is having a traffic cop at each junction.
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