One way is to take aggregate vehicles for an area and divide it by total households for an area. You can get Aggregate Vehicles from B111103 - Aggregate Number of Vehicles Available in Households (1) (Occupied housing units) and Total Households from A112209 - Household size (5) by Number of workers in household (6) (Households) So for Pima County Arizona you get 641035 vehicles and 381880 Households yielding 1.68 Cars per Household. Of course this ignores the MOE. Penelope Z. Weinberger CTPP Program Manager AASHTO 202-624-3556 ctpp.transportation.org From: ctpp-news-bounces(a)chrispy.net [mailto:ctpp-news-bounces@chrispy.net] On Behalf Of Sulabh Aryal Sent: Thursday, January 02, 2014 12:46 PM To: ctpp-news(a)chrispy.net Subject: [CTPP] No. of vehicles physically located in households. Hello everyone, I was locking through CTPP 2006-2010 tables and was wondering which would be the best table to be used to calculate the number of vehicles (autos) physically located in households. Any suggestion would be appreciated. Thanks, Sulabh Aryal Associate Planner Richmond Regional Planning District Commission 9211 Forest Hill Avenue, Suite 200 Richmond, VA 23235 Phone: 804.323.2033 3 Fax: 804.323.2025 saryal@richmondregional.org<mailto:saryal@richmondregional.org> 3 www.richmondregional.org<http://www.richmondregional.org>

I am not sure what your question is, but I will try to answer it. The Question in the ACS reads: “How many automobiles, vans and trucks of one-ton capacity or less are kept at home for use by members of this household?” The answer can be 0-1-2-3-4-5, or 6+ There are MANY tables in the CTPP which include this variable, but if you are interested in the AGGREGATE number of vehicles in households, you can use B111103 “Aggregate vehicles in households”. Since it is a B Table, which uses the privacy protected ACS microdataset, there are possibly problems because the weights are adjusted for workers and not households. So, you MIGHT prefer to use a Set A Table instead, such as A111102 which is a univariable distribution of Vehicles Available. Elaine Murakami FHWA Office of Planning 206-220-4460 (in Seattle) From: ctpp-news-bounces(a)chrispy.net [mailto:ctpp-news-bounces@chrispy.net] On Behalf Of Sulabh Aryal Sent: Thursday, January 02, 2014 9:46 AM To: ctpp-news(a)chrispy.net Subject: [CTPP] No. of vehicles physically located in households. Hello everyone, I was locking through CTPP 2006-2010 tables and was wondering which would be the best table to be used to calculate the number of vehicles (autos) physically located in households. Any suggestion would be appreciated. Thanks, Sulabh Aryal Associate Planner Richmond Regional Planning District Commission 9211 Forest Hill Avenue, Suite 200 Richmond, VA 23235 Phone: 804.323.2033 3 Fax: 804.323.2025 saryal@richmondregional.org<mailto:saryal@richmondregional.org> 3 www.richmondregional.org<http://www.richmondregional.org>