Mirror Sight Aids with Traffic

This is an interesting image. It shows a policeman using a mirror to direct traffic at 14th St. and Pennsylvania Avenue, probably sometime in the 1920s. It also shows and interesting device that not only rotated to show “stop” and “go” messages to traffic, but included an umbrella for days when the sun was too intense. (library of Congress, #cph 3b42604)directing-traffic

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