Traffic Lights
Traffic lights manage heavy traffic and give motorists a better driving experience. However, traffic lights have not always been as simple to operate because the old traffic lights required a lot of human intervention. During the day, semaphores were employed to regulate it, while gas was utilized to enhance visibility at night.
Today, traffic lights are designed to regulate traffic with ease, making them one of humankind’s most significant inventions as roads get clogged up all the time.