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"The point sticks in your head: physics rules. Virtue does not triumph unless the physics allows it."
- 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 D. Appleton and Co. 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?
  - Tired Of Speeders On Your Block? DIY Speed Tracker!

Articles related to Transportation
Elon Musk's Traffic Tunnel Challenge Is Boring
HVSD, Kitty Hawk's Electric Plane
Skai Air Taxi Costs The Same As Uber
Asimov and Musk - Boring Company Tunnel vs. Street Race

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