World War 2: Black-out picture gallery - Telegraph http://www.flickr.com/photos/brizzlebornandbred/sets/72157619314106190/ london in wartime..
British WW2 poster warning pedestrians to cross roads with great care during Blackout periods. Hundreds of people were killed and injured in road traffic accidents due to the strictly enforced Blackout regulations. 1939 - View of road under ordinary car headlights at night, which is dangerous in case of air raids as a path of light makes a good target for German bombers. 1939 - View of same road visible under a 'glow in the dark black light' of car headlights after being fluorescently painted.