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The CTPP is a set of special tabulations designed by transportation planners using large sample surveys conducted by the Census Bureau. From 1970 to 2000, the CTPP and its predecessor, UTPP, used data from the decennial census long form. The decennial census long form has now been replaced with a continuous survey called the American Community Survey (ACS). Therefore, the CTPP now uses the ACS sample for the special tabulation.
The first CTPP using the ACS is the 2006-2008 CTPP, using 3 years of the ACS and is restricted to geographic units (counties and places) with population of 20,000 or more. The 2006-2010 CTPP, using 5 years of ACS is due to be delivered to the American Association of State Highway and Transportation Officials (AASHTO) in May 2013 and will include small geographic units such as census tracts and Transportation Analysis Zones (TAZs).
The CTPP tabulations are unique because they include three geographies:
To learn more and access CTPP data products, visit the Data Products page.
As the Census Bureau has replaced the decennial census long form with the American Community Survey (ACS), future CTPP will be based on the ACS. In late 2006 the American Association of State Highway and Transportation Officials (AASHTO) committed to a new multi-year Census Transportation Planning Products (CTPP) consolidated purchase to begin incorporating of ACS data into transportation planning practices.
More information about CTPP is available at www.trbcensus.com.
The American Community Survey (ACS) is a continuous monthly survey conducted by the U.S. Census Bureau which began in 2005. Most of the questions in the ACS are the same (or similar) to the Census 2000 long form. Access the Census Bureau's page on ACS.
Longitudinal Employer-Household Dynamics (LEHD) is a program within the U.S. Census Bureau that uses modern statistical and computing techniques to combine federal and state administrative data on employers and employees with core Census Bureau censuses and surveys while protecting the confidentiality of people and firms that provide the data. LEHD is potentially an alternate/additional source of place of work and flow data. Click here to access the Census Bureau's page on LEHD.