What does a solid yellow left arrow signal indicate?

• Drivers must stop immediately and not turn left.
• Drivers should speed up to make the left turn quickly.
• Drivers should prepare to stop as the left turn signal is about to change to red.
  Explanation:

  "A solid yellow left arrow warns that the protected left-turn phase is ending. Drivers should prepare to stop if it is safe or proceed with caution if they are already in the intersection."
• Drivers can turn left without yielding to oncoming traffic.