Historedia
Group or institution

Police Officers

Events
1
Episodes
2
Years
1868–1869

Every event in Historedia whose sources name Police Officers, with the role they cite and all of that event’s episodes. This is not a biography, and mentions are grouped by name, so two people with the same name can share this page.

Events and episodes

  1. World's first traffic signal lights installed in Westminster, London

    1868–1869

    Role: Traffic Control

    1. December 1868 · Parliament SquareFirst Traffic Signals Installed

      First traffic signals showing red or green lights at night were installed in London in December 1868 to reduce police traffic control needs.

    2. 2 January 1869 · Parliament Square (installation site; explosion site not localized in sources)Signal Explosion and Removal

      The traffic signal system exploded on 2 January 1869 and was subsequently taken down.

Sources

  1. Traffic light Wikipedia, revision of 2026-09-01