What if I refer to locations as "nodes"?

The top of the New Diagram Box contains buttons for choosing between diagram query types.  Select "node".

If you have created a nodes list file, and it is available you can locate the node by name or by number, and the name will be displayed on the diagram instead of the number:  See: *.NOD.

Once the diagram is created, you can change the schematic to more accurately reflect the type of roadway being depicted.  See Schematic.