Question

What are the colours of traffic signals?
(A) Red
(B) Amber
(C) Green
(D) All of the above

Answer 1

A conventional vertical traffic signal has three aspects, or lights, facing oncoming traffic: red at the top, amber at the bottom, and green at the bottom. One facet is usually lit at a time. In more complicated road traffic junctions, a fourth aspect, such as a turn arrow, may be located below the three lights or aspects.

Complete Step By Step Answer:
Traffic lights are signalling devices used to manage traffic flow at road junctions, pedestrian crossings, and other sites. In December 1868, the world's first traffic light, a manually controlled gas-lit signal, was erected in London. It detonated less than a month after being installed, wounding the police officer who operated it. In 1910, Chicago's Earnest Sirrine invented the first automatic traffic management system. The words "STOP" and "PROCEED" were used, however neither was lighted. Users' right of way is alternated with a series of lighting bulbs or LEDs of three standard colours at traffic signals, which follow an uniform colour code:
Green light.
Allows vehicles to go in the indicated direction if it is safe and there is space on the other side of the intersection.
Red light.
Allows no traffic to pass through. When a flashing red light appears, vehicles must come to a complete stop and then proceed when it is safe to do so (equivalent to a stop sign).
Amber light (sometimes known as 'orange light' or 'yellow light') is a kind of light that comes in a variety of colours.
The light is about to change to red, and some jurisdictions require cars to stop if it is safe to do so, while others allow automobiles to go through the junction if it is safe to do so.
Hence option D is correct.

Note:
If the conflict monitor identifies an issue, such as a malfunction that tries to display green lights to conflicting traffic, traffic signals in some nations will flash. The signal may flash amber on the main road and red on the side road, or it may flash red in all directions. The flashing mode can also be utilised at times of the day when there is less traffic, such as late at night.