Your site has a bug that is affecting URLs specified in the the url tag. It is converting “% 2F” into actual slashes.
Here is the URL:
http://maps.google.com/maps?f=d&saddr=W+Main+St/US-21&daddr=Grayson+Turnpike/US-21+to:36.866438,-81.156864&hl=en&geocode=FeK1MwIdQqIq-w;FWC1MgIdYqwp-w;&mra=dme&mrcr=0&mrsp=2&sz=13&via=1&sll=36.907627,-81.117725&sspn=0.094847,0.180588&ie=UTF8&z=13
Here is the URL after the site has mangled it:
http://maps.google.com/maps?f=d&saddr=W+Main+St/US-21&daddr=Grayson+Turnpike/US-21+to:36.866438,-81.156864&hl=en&geocode=FeK1MwIdQqIq-wFWC1MgIdYqwp-w&mra=dme&mrcr=0&mrsp=2&sz=13&via=1&sll=36.907627,-81.117725&sspn=0.094847,0.180588&ie=UTF8&z=13