ROAD TRAFFIC CONTROL
Traffic control from the air : the observer tells the police by radio-telephone the state of traffic, which can then be halted or diverted in case of accident or congestion
Picture No
10146839
Media ID
47369265
Size
3027px x 4293px
(1.6MB)
Credit
Mary Evans Picture Library
Source
Unnamed photographer in the Wonder Book of Electricity page 112
Date
circa 1937
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Circulation Congestion Diverted Halted Observer Tells
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