It is usually on the bottom of the traffic light.
bottom
The green light on the traffic light is on the bottom. The yellow is in middle, the red is on top. However, in some municipalities, the traffic lights are not vertical, they are horizontal. In these instances, the green light is usually, but not always, the furthest to the right.
On a vertical display traffic signal the green light is on the bottom. On a horizontal display traffic signal it is to the right, but may depend on that state (or municipality's) practice.
The lowest light on a traffic signal is green. Some cities use traffic lights that are not arranges top to bottom but rather side to side. In this event the green light is usually the furthest to the right.
red, yellow,green
Green-Yellow-Red-Green For color blind people the traffic light would be upright and from top it would be. Red Yellow Green.
From top to bottom: Green is on the top Yellow is in the middle Red is on the bottom There you go!
A traffic light you seen change to green
a fresh green light is when the traffic light has just turned from red to green
Yellow light
'Go'.