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30 A Guidebook for Using American Community Survey Data for Transportation Planning geocoding.12 This cautionary tale underscores the poor likelihood that actual ACS data would be made available for transportation planning uses. 3.1.10 Census Transportation Planning Package (CTPP) For the last several decennial censuses, transportation planners have relied on the CTPP, a series of specialized tabulations produced by the Census Bureau and sponsored by AASHTO, that provided transportation-related estimates, including journey-to-work flow tabulations. 3.2 Additional Information Sources for Obtaining ACS Data The Census Bureau provides guidance for obtaining ACS data on their ACS website and on the American FactFinder website. The documentation is very accessible. From the ACS main guidance, webpage users can find several useful links and documents, including the following: The ACS in American FactFinder Quick Guide (discussed previously); Other guide documents, including ACS at a Glance and ACS Data Products Overview; New data product announcements; Table specifications (shells) for available and proposed new tables; and Documentation on the latest year's data release, such as the specific geographic coverage and new tables. The information on this web page will be continuously updated, so it is likely to be frequently visited by both new and experienced users. 12 See http://www.fhwa.dot.gov/planning/census/sfacs.pdf (accessed June 2007).