The concept of the traffic light actually dates all the way back to the 1860s, where gas-lit signals were placed on the posh streets that lined the Houses of Parliament in London. Of course, back then, nothing was automated; a police officer would be on standby, monitoring the traffic and manually changing the signal as necessary. It wouldn’t be until the 1910s that the first electric traffic signals would crop up in the United States, followed by interconnected systems
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