The new traffic lights you are seeing are made out of arrays of light emitting diodes (LEDs). These are tiny, purely electronic lights that are extremely energy efficient and have a very long life. Each LED is about the size of a pencil eraser, so hundreds of them are used together in an array.

Four new traffic lights have been installed along crosswalks in Santa Clara, and they're confusing drivers because they have no green lights.

These elements continually influence one another directly or indirectly in order to maintain its existence and achieve its goal. So for this week, we’re going to discuss one of the systems that are being used and implemented in our society, the traffic light system. And as we go on, we’re also going to discuss in this article the different types of traffic lights that are currently being used today.

In Dresden much has changed over the last 28 years. Communism collapsed, democracy blossomed and the city was reborn. But one thing has remained the same - a traffic light which has stayed red since 1987.

Rising traffic congestion is an inescapable condition in large and growing metropolitan areas across the world, from Los Angeles to Tokyo, from Cairo to Sao Paolo. Peak-hour traffic congestion is an inherent result of the way modern societies operate. It stems from the widespread desires of people to pursue certain goals that inevitably overload existing roads and transit systems every day. But everyone hates traffic congestion, and it keeps getting worse, in spite of attempted remedies.