A traffic officer in Washington DC, USA, using a manual semaphore to control traffic. He has a rear view mirror so he can see traffic behind him when
A traffic officer in Washington DC, USA, using a manual semaphore to control traffic. He has a rear view mirror so he can see traffic behind him when looking in the opposite direction. These manual signalling systems were eventually replaced by automatic traffic lights. This photograph was taken between 1915 and 1923.
Size: 4488px × 6284px
Photo credit: © LIBRARY OF CONGRESS/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: 1900s, 1915, 1920s, 1923, 20th, america, american, car, century, city, control, dc, historical, history, lights, man, manual, mirror, north, officer, police, rear, road, safety, semaphore, sign, signal, signalling, street, town, traffic, transport, urban, usa, vehicle, view, washington
