What is the purpose of this centre lane with left-turn arrows?

• It is a passing lane for high-speed vehicles.
• The lane is for emergency vehicles only.
• It is a shared left-turn lane for vehicles from both directions.
  Explanation:

  "This type of lane allows vehicles traveling in opposite directions to safely turn left without disrupting the flow of traffic in the main lanes. It is not for through traffic or passing and is commonly used in urban areas with multiple driveways and intersections."
• It is a dedicated U-turn lane.