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Fill in the blank traffic lights only became necessary in the 19th century, when traffic?

Traffic lights only became necessary in the 19th century, when traffic began to increase. A traffic signal (1)..................................... by J O Knight, a railway signaling engineer, was installed outside the Houses of Parliament in London in 1868. It looked like a railway signal of the time but a few weeks later it blew up,and signal of this type were no (2)....................................... used. The mordern traffic light is an American invention, the first red and green lights. set up in Cleveland in 1914 followed a few years later by three-colour lights in New York. These new lights didn't arrive in Britain (3)................................... 1925. A year later, the first automatic lights were installed at a road junctionin Wolverhampton, where they remained in (4)............................. for the next 42 years. At the beginning of the 1930s, the first vehicle-activated lights were set up in London. Since these early days, traffic light design has developed to cater for (5)........................................ types of road user.

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Trả lời (1)

  • 1.invented
    2.longer
    3.until
    4.use
    5.different

      bởi Nguyễn Thị Trinh 27/12/2019
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