The 2006-2008 CTPP data are available on the AASHTO CTPP website.  Similar to other ACS 3-year tabulations, these data are restricted to geographic units with Counties and Places with 20,000 population and over.  This means that the results are like “swiss cheese,”  that is, very holey.  For example, if you have 6 counties in your planning area, but only 4 counties have population over 20,000,  then the results will not include the other 2 counties.  The same thing happens when looking at Place (City and Census Designated Place) values. 

For residence tabulations, you might consider using Census 2000 PUMAs since they have a complete geographic coverage.  But, workplace PUMAs are not really PUMAs for this round of CTPP, as the small area workplace allocation is not yet completed. 

Nonetheless, we hope these data will provide some utility!  As a starting point, you may want to examine some residence tables (Part 1) for tables such as means of transportation to work by household income. 

To use the data, you may want to first look at the on-line tutorials: http://ctpp.transportation.org/Pages/3yrdas.aspx

There is a small tutorial on the CTPP, but you may also want to look at the tutorials on the overall Web Data Server, especially the one on “dimensions”.    The CTPP software built by Beyond 2020 is a customized version of their Web Data Server.

You may want to watch and listen to the session from yesterday (March 3)

http://fhwa.adobeconnect.com/p15478140/

This was the first attempt at a training session on using the software. Penelope Weinberger at AASHTO plans to schedule additional sessions. 

For additional assistance, please contact Ms. Liang Long, CTPP Technical Support   liang.long@dot.gov  202-366-6971