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"We follow the scientists around and look over their shoulders. They're watching their feet: provable mistakes are bad for them. We're looking as far ahead as we can, and we don't get penalized for mistakes."
- Larry Niven

Instantaneous Kodaks (Traffic Control)  
  Use of cameras to help police officers enforce speed limits.  

This is a very early reference to this idea.

"The policemen on duty also have instantaneous kodaks mounted on tripods, which show the position of any carriage at half-and quarter-second intervals, by which it is easy to ascertain the exact speed, should the officers be unable to judge it by the eye; so there is no danger of a vehicle's speed exceeding that allowed in the section in which it happens to be; neither can a slow one remain on the fast lines.
From A Journey In Other Worlds, by John Jacob Astor IV.
Published by Unknown in 1894
Additional resources -

Robert Heinlein had a more "modern" version of this in Methuselah's Children, published in 1941; see the traffic control camera.

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Additional resources:
  More Ideas and Technology from A Journey In Other Worlds
  More Ideas and Technology by John Jacob Astor IV
  Tech news articles related to A Journey In Other Worlds
  Tech news articles related to works by John Jacob Astor IV

Instantaneous Kodaks (Traffic Control)-related news articles:
  - Multi-Target Photo-Radar System
  - Speeding Ticket Robots To Cite Autonomous Cars?

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Hyperloop Transport Proposed By Tesla's Elon Musk
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myTaxi iPhone App May Transform Taxi Business

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