Some Vintage Photos, Part 2/2

An automatic counter for measuring the total volume of traffic requires no directional control, since it records all vehicles passing in either direction. Its main purpose is to act as a check on the total number of vehicles as shown, Rockville, Md., December 23, 1942. However, even during heavy traffic, the speeds of nearly 100 per cent of the vehicles are recorded by the speed meter. (Photo by AP Photo)
Some Vintage Photos, Part 2/2
   
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