In the late 19th century, due to the industrial revolution, many cities of the world grew rapidly and the number of vehicles on the roads also started increasing. Due to this, traffic jams started occurring everywhere. To solve this problem, a device was needed that could control the traffic on the roads.

It is said, "Necessity is the mother of invention." With this thought in mind, the first traffic light was invented in Britain. In the year 1868, a gas-operated traffic light was installed for the first time at a railway crossing in London. At that time, this light had only two colors - red and green. Red color meant stop and green color meant go. This traffic light was operated manually by a policeman.

Traffic lights arrived in America a little late. In 1912, Lester Wire, a policeman in Salt Lake City, Utah, invented the first electric traffic light. This light also had only two colors - red and green, and its function was the same - red meant stop and green meant go. In the 1920s, another color - yellow - was added to the traffic light. Yellow meant that the red signal was going to turn on soon, so drivers should get ready to stop.

Over time, traffic lights have evolved and new features have been added to them. Today's traffic lights also have special signals for pedestrians, such as green and red lights for walking or stopping. The use of traffic lights in India began in the mid-20th century. Today, traffic lights are common in all major cities of India and play an important role in smooth flow of traffic on the roads.

Aishwarya Rai-Abhishek Bachchan's Divorce Confirmed? Fans Shocked by the Video

Key Leaders Gather for BJP Strategy Meeting Ahead of Uttar Pradesh By-Polls

Amitabh Bachchan Celebrates 82nd Birthday: A Legend Honored by Fans and Co-Stars