What do these signals indicate?

• They instruct drivers to stop immediately.
• They guide traffic to move or merge into the mentioned lane to improve traffic flow or clear lanes.
  Explanation:

  "These signs are "Merging guide" signs. They guide traffic to move or merge into the specified lane to better traffic flow or clear lanes."
• They prohibit vehicles from entering certain lanes.
• They indicate the end of a roadway or lane.