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 | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Library of Congress |
Taille de l’image : | 4488 px × 6284 px |
Model Release : | Le droit n'est pas encore disponible. Merci de nous contacter avant utilisation. |
Property Release : | Non requis |
Restrictions : | - |