The world's first traffic signal was short lived. Installed in London in 1868, it exploded less than a month later, injuring its policeman operator - Study24x7
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Goraksha Dadhich
18 Mar 2019 11:35 AM study24x7 study24x7

The world's first traffic signal was short lived. Installed in London in 1868, it exploded less than a month later, injuring its policeman operator

Banking Railways UPSC Sciences
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