[CTPP] CTPP Part 3

Hi All, I am a new user of the CTPP data and am in the process of comparing CTPP part 3 tract-tract worker flow data to the Home-Based Work trip table from the travel demand model I am currently working on. I came across a few questions/issues for which I would welcome your thoughts/experiences: 1) Do the CTPP part 3 flows account for all the home-based work trips? I noticed that the commonly accepted home-based work attraction rate is about 1.5 trips per total employment (NCHRP 365) and this creates more HBW trips than there are in the CTPP part 3. Let me know if I there is something wrong in my interpretation of the data. 2) How much success have the MPO's had in calibrating their trip distribution models based on CTPP Part 3? What level of accuracy is typically desired? Thanks! Jiji Jiji V. Kottommannil Transportation Modeling Specialist,E.I.T. Crawford Bunte Brammeier Phone: 314-878-6644, Ext. 38 Fax: 314-878-5876