Re: [CTPP] RE: private vehicle occupancy data from ACS

Don't mind Steve--he is just giving a shameless plug for the NHTS ;-) In the ACS you can get a vehicle occupancy for people commuting to work. It takes a little work but you can calculate it from table B8301 (mode to work). The trick is what assumption do you use for the 5-6 people per car (maybe 5.5) cohort and the 7+ category. In 1990 we actually knew the factor and it was around 0.3xxx. Try a few numbers and see what you like, 7.2 people per car; 7.3, but I would not go over 7.5 Now for another shameless plug. One of the beauties of the CTPP tabulations is that there is a vehicle occupancy table for the work commuters. Unfortunately, with the 3-year CTPP it is only carried out to 1 decimal so everything is 1.1. I believe the 5-year tab due out sometime in 2013 will have 2 decimal places. Back to the NHTS, it's strength here is that it has all trip purposes. Polzin, Steve wrote: -- Ed Christopher 708-283-3534 (V) 708-574-8131 (cell) FHWA RC-TST-PLN 4749 Lincoln Mall Drive, Suite 600 Matteson, IL 60443