Lights are situated as red, yellow, green. In complicated traffic patterns, lights can be arrows, or the /do not/ indicators. When a traffic light is non-functioning at an intersection, the first to the right has right of way, and each driver from each of the 4 sides takes a turn in that order.
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.
The red light on a traffic light is typically located at the top. The sequence of lights from top to bottom is red, yellow, green.
a green light
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.
A traffic light you seen change to green
a fresh green light is when the traffic light has just turned from red to green
It is usually on the bottom of the traffic light.
'Go'.
Yellow light
Fresh green light
bottom