Editor's note: This is not a legal access to the Barton Creek Greenbelt.
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This trail is known in Austin as the Jedi trail. It is fun to take fast and has nothing too technical. The scenery is the best during the spring.
Starting driving Southbound MOPAC (loop 1), turn right onto Southwest Parkway. Drive 1.5 miles and turn right onto Foster Road for 1.9 miles. Next to the Regent Hills Sign is an entrance to a jogging path on the left. Walk your bike to the Greenbelt.
http://www.singletracks.com/item.php?c=1&i=1543