Garrett A. Morgan was the father of traffic lights. He was an American. Morgan was born in 1875. His family was very poor. He left school at the age of 14. He was very clever. He always looked for better ways to do things. And he liked to make new things. At that time, every...
The first electric traffic light had only red and green lights; it did not have a yellow light like modern-day traffic signals. Instead of a yellow light, it had a buzzer sound that was used to indicate that the signal would be changing soon. The First Four-way And Three-colour Traffic...
当我们想起著名的科学家及发明家时,我们第一时间会想到贝尔（阿力山大.格瑞厄姆.贝尔）,爱迪生（汤马斯....