Although CTPP 2006-2010 will not be out until the year of 2013, but Traffic Analysis Zone (TAZ) and Traffic Analysis District (TAD) delineated for CTPP 2006-2010 are available now in the Census Bureau FTP site.    Here is the link:

For TAZ, go to this ftp site
ftp://ftp2.census.gov/geo/pvs/tiger2010st/
[THEN PICK YOUR STATE Folder--you have to select the state-level directory twice.  TAZ files are NOT under the county-level directory, only the state. The file name is tl_2011_XX_taz10.zip (where XX= State FIPS)
For example, South Caroline TAZ files are in this directory:
<ftp://ftp2.census.gov/geo/pvs/tiger2010st/45_South_Carolina/45/tl_2011_45_taz10.zip><ftp://ftp2.census.gov/geo/pvs/tiger2010st/45_South_Carolina/45/tl_2011_45_taz10.zip>


TAD:
ftp://ftp2.census.gov/geo/pvs/tiger2010st/
[SCROLL to BOTTOM]
File name is: tl_2011_us_tad10.zip
<ftp://ftp2.census.gov/geo/pvs/tiger2010st/tl_2011_us_tad10.zip><ftp://ftp2.census.gov/geo/pvs/tiger2010st/tl_2011_us_tad10.zip>

Feel free to contact me if you have any questions.

Liang Long
Cambridge Systematics, Inc.
4800 Hampden Lane
Suite 800
Bethesda, MD 20814
tel  301 347 9141
fax 301 347 0101
FHWA 202-366-6971
e-mail  llong@camsys.com
www.camsys.com