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Traffic light

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Sets of traffic lights in Whitehall, London.

A traffic light is a Muggle device for regulating the flow of vehicular traffic at an intersection, featuring changing signals of light. A green light is used to indicate "go," that vehicles can proceed, while a red light means vehicles must stop in the direction facing that light.

In 1991, Harry Potter observed that his uncle Vernon Dursley's "face went from red to green faster than a set of traffic lights" upon first glancing at his initial Hogwarts acceptance letter.[1]


Notes and references

  1. Harry Potter and the Philosopher's Stone, Chapter 3 - (The Letters from No One)

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