What does this sign mean?

• Vehicles can only turn left when the light is green.
  Explanation:

  "This sign indicates that vehicles are permitted to make a left turn when the traffic light is green. It is typically placed at intersections where a dedicated left-turn signal is not present, ensuring that drivers know they must wait for a green light before turning."
• Left turns are prohibited at all times.
• Vehicles can turn left on any traffic signal.
• Vehicles must stop before making a left turn.