At the bottom of the page is a link "Raw Route Description".
Right-click on that link and say "Save Target As".
Save it as a file name that represents the directions with an HTM extension. For example "Trip to Morro Bay.htm".
Then go to a DOS prompt in that directory and type...
parse_mapsonus.py "Trip to Morro Bay.htm"
It should save a file called "Trip to Morro Bay" with no file extension.
I've written a batch file wrapper to all of this which also FTP's the resulting file to the empeg and cleans up after itself.