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.