A light
It simply means that the light's been green for a time already, as opposed to a fresh green light, which just turned green.
If you are blocking traffic flow for a long time then yes.
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Rule of thumb. If the light has been green for a while, expect it to change and check your speed. You need to know how much room you have to stop safely. Find a point of no return. Once you cross that point you will have to through the light as long as it is yellow. You should have plenty time between the green light and the red light to stop. The time limit varies with each intersection depending on if the light is set on a timer or if it is on a trip.
Been a long time but i think it is hidden in the walls
Well it depends on what you mean. The distance for how long it takes, or the time as in how long since Earth was made. Earth as you know has been here a long long time. Stars light has been shinning towards Earth eversince it was made. To see how long it takes for a stars light to reach Earth depends on how distant and huge the star is.
Grass has been green for a long long time - even back in the olden days.
You don't have to wait any amount of time when the light turns green, when the light turns green that means the intersection is safe for you to proceed.
When the traffic light comes into view and it's green, it was likely green for a long time, unless you also observe cars just starting to get going. If you see the traffic light is green in the distance we call this green light "stale", meaning it could turn yellow any second. A traffic light that just turned green, we call this green light "fresh", meaning it just turned green and it won't be turning yellow for a little while. Of course these times between from when it turns green then back to yellow and red again varies on the intersection. To answer the question when you're approaching a green traffic light you should prepare to stop as that green light is "stale". You don't necessarily have to slow down just get ready to hit the brake.
Hold the button for however long you want (This will be the time the light turns green to press the letters) and press the letters
The light wakes you up because you are very sensitive to the light when you first wake up. Your eyes have been in darkness for a long period of time and now light is hitting them.
Hold the button for however long you want (This will be the time the light turns green to press the letters) and press the letters