I want to do this for a cople of things. Some rivers have changed course and I want to cut out the old location and replace it with the new.
When making transparent maps a major river or big lake crossing a road covers it up. For a small stream, it is not a problem, but for a major river like the Mississippi, it is a problem. I usually just edit the nodes and move them close together so it is just barely visible crossing the rd. But splitting it may be easier.