[Answer] How were the first traffic lights illuminated?

Step 1 : Introduction to the question "How were the first traffic lights illuminated?"

...Traffic jams were a significant problem long before automobiles were on the road. In the 1860s, British railway manager John Peake Knight adapted a semaphore signalling system (rotating arms that signalled trains to stop or go) into the world’s first traffic light. During the day, the semaphores would let busy drivers know when it was their turn to move forward; at night, gas lamps illuminated red and green lights for the same purpose.

Step 2 : Answer to the question "How were the first traffic lights illuminated?"

Gas lamps:

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