Diagram of former TriMet bus service distribution on the Portland Mall (5th Avenue) in central Portland.  
Notes:  Buses enter the mall at the place on the left, stop at the mall stops designated by the symbol in the center and leave 5th Avenue at the street indicated on the right.  Travel is from north to south and thinner lines represent rush-hour only service.
Made by me, Jason McHuff, in Microsoft Word 2002 ("XP") and converted to a Windows Metafile using Microsoft PowerPoint and then Scalable Vector Graphics using OpenOffice.org.  Finally, extensively cleaned up using Inkscape and a text editor.
This  diagram was created with Microsoft Word.