CTPP list, Ed, and others who gently chided me off list for calling the Census data "flawed" -- I agree that I poorly though out the comment where I called the Census data flawed, and we are all indebted to the hard work of our FHWA colleagues, Chuck, and many others for making sure the Census even has transportation questions! The technical point I was trying to make is that looking at the CTPP worker-flow, usual-mode information as "tripmaking" isn't right. It's clearly useful, and one of the few national snapshots we have that develops some decent work travel information. Like all our other data sources though, it's clearly limited. Not "wrong", not "flawed", but you've probably noticed it gets trumpeted in the media because it's "the Census" and any number of other more travel-focused surveys like NHTS or FTA ridership numbers get a small mention in paragraph 13. Trust me, I understand that the transportation profession needs to be able to tease out the important information from a wide variety of data sources. I was/am trying to contribute to that by pointing out one reason for the discrepancy that Chuck's thread identified, then I went and turned it into a mini-rant. No more, I promise! (thread deleted, as it was getting really long!) Chris. ------------------------------------ Christopher V. Forinash U.S. EPA: Office of Policy, Economics and Innovation 1200 Pennsylvania Ave NW (MC 1808), Washington DC 20460 (Delivery: 401 M St. SW, #WT-1013D) 202-260-5044 vox 0174 fax; forinash.christopher(a)epa.gov ------------------------------------ Development, Community & Environment Division: http://www.epa.gov/smartgrowth A partner in the Smart Growth Network: http://www.smartgrowth.org