Why do traffic lights have three separate light bulbs instead of having one?

So why are three separate light modules still used for three different colors? Because, besides the color of light in traffic lights, the position of the light is also important for drivers. Colorblind drivers and pedestrians can understand which light is on thanks to the position of the light.

1. What is a 3 way traffic light?
2. What is the purpose of double red lights?
3. How many lights are there in a traffic light?
4. Why are there two sets of traffic lights?

What is a 3 way traffic light?

A three-way junction (or three-way intersection) is a type of road intersection with three arms.

What is the purpose of double red lights?

A solid double red light has the same meaning as a single red light. Right turn at red light – Unless a sign prohibits the turn, a driver may turn right at a red light after stopping completely before the stop line or crosswalk, if the turn can be made safely after yielding to other traffic.

How many lights are there in a traffic light?

Traffic light is a set of 3 coloured lights for regulating traffic at road junctions and pedestrian crossings. The three colors are red, amber and green.

Why are there two sets of traffic lights?

A secondary light is there in case the primary light doesn't work. It also helps you see the traffic lights on approach and while you're waiting at the stop line so that you don't have to strain your neck to see it.