speed trap

noun
a section of a road where hidden police, radar, etc., carefully check the speed of motorists and strictly enforce traffic regulations: sometimes characterized by hard-to-see signals, hidden traffic signs, etc.

Origin:
1920–25

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
speed trap
 
n
a section of road on which the police check the speed of vehicles, often using radar

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Probe data were compared with speed trap data from instrumented roadway
  locations.
The lower speed calculated from timing of pulses generated by the two-loop
  speed trap is attributed to a pair of factors.
However, it is the responsibility of the traffic engineer to establish a speed
  limit which does not create a speed trap.
First, using a speed trap station, a pair of detectors is placed on a length of
  roadway.
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