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| Picture No | 10146839 |
| Date | circa 1937 |
| Description | ROAD TRAFFIC CONTROL |
| Details |
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.
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| Source | Unnamed photographer in the Wonder Book of Electricity page 112 |
| Credit | Mary Evans Picture Library |
| Restrictions |
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