Hi, I'm working on a Google Maps App that will attempt to create
directions between any two points in the world. I'd like it to do
actual turn-by-turn directions where-ever possible (e.g. US/Canada,
Europe, Australia, Japan, etc.) and simply draw straight point to
point lines if the starting and ending point don't reside in the same
directions-supporting region.

To that end, I'm wondering if Google, or anyone else, has created the
complete polygons that define each of the contiguous regions that
support turn-by-turn directions (full list: 
http://en.wikipedia.org/wiki/Google_Maps#Directions)?
Or alternatively, is there a way to generate such polygons?

I can use something like http://maps.google.com/maps/geo?q=Europe to
get the overall region bounding box, however, this call returns a
simple rectangular bounding box, while I want a mapping that precisely
maps the region's borders, and excludes any contained subregions that
do not support directions (e.g. most of Europe supports directions,
however, a number of countries do not, including Romania, Macedonia,
Albania, etc.)

Thanks!
Alex.

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