What should a Class E driver do when heavy rain, dense fog, or darkness makes visibility poor?

1. Travel down the center dividing line without lights
2. Activate lanterns, ensure all retroreflectors are clean and wiped of mud, pull completely onto the wide shoulder, and if visibility is critically compromised, halt safely off the road until conditions improve
3. Whip the horse to travel at maximum speed
4. Turn off all lanterns to save battery