A FLASHING AMBER LIGHT MEANS YOU SHOULD APPROACH THE LOCK UNDER FULL CONTROL. This direction is meant for boaters who are locking through a dam. When approaching a lock, the boat should produce one long whistle sound followed by one short blast at about a mile from the lock in order to let the lock operator knows that you desire lockage, then follow the traffic signal.
What text? Is there something that you could put in there?: