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

Thanks Ed: I didn't want to have to correct Steve. Isn't there a total vehicle count also somewhere in ACS? I recall using it to calc the top category so that it all comes out right. -----Original Message----- From: ctpp-news-bounces(a)chrispy.net [mailto:ctpp-news-bounces@chrispy.net] On Behalf Of Ed Christopher Sent: Friday, May 20, 2011 6:06 PM To: ctpp-news(a)chrispy.net Subject: 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: 2009 NHTS would have vehicle occupancy data. On Behalf Of Jim Hubbell 2009 ACS 1-year estimates, and am having some difficulty finding the table that includes this calculation. Can anyone provide me with the ACS table number? Any help would be greatly appreciated.