The green arrow is what is often known as a "filter." This means vehicles are permitted to proceed with caution in the direction indicated by the arrow.
A green arrow means that (assuming the traffic lights are not malfunctioning) it is safe to turn in the direction of the arrow, if you are in the correct lane. This is different from simply a green light, which means you may turn (if the green light is for the turn lane) but you must yield to oncoming traffic.
A solid yellow arrow at a traffic light means that the signal is about to change from a green arrow to a red arrow and you should prepare to stop. It usually indicates that you should clear the intersection if you are already in it, but not make any new turns.
If you are referring to a green arrow pointing upwards at a traffic light then that is pretty much the same thing as a green light signalling for traffic to continue moving forward. Traffic is allowed to move in the direction of the arrow. Commonly used to allow "protected" left turns at an intersection while the red ball prevents traffic from going straight across the intersection.
A yellow arrow traffic light means that you should yield in the direction you are going. These are often in place when you are turning left.
A green traffic light arrow pointing up indicates that vehicles may proceed straight ahead in that direction. It means that the lane is open for movement, and drivers can continue forward without stopping, provided it is safe to do so. However, they should still be aware of pedestrians and other traffic.
The Red Light Is Telling Everyone To Stop. The Green Arrow Is Telling You It Is Ok To Turn At That Time (Which Ever Way The Light Is Pointing).
A yellow arrow traffic light means that you should yield in the direction you are going. These are often in place when you are turning left.
People are allowed to turn in the direction the arrow is pointing, but they can not go straight across the road, that should really be common since.
The green arrow is what is often known as a "filter." This means vehicles are permitted to proceed with caution in the direction indicated by the arrow.
A green arrow showing same time as a red light proceed carefully in the direction of the arrow after yielding the right-of-way to other vehicles and perdestrians
It means stop first then can proceed if clear
A flashing yellow arrow light means you may turn left, but you must yield to oncoming traffic and pedestrians.