2 Mar
2010
2 Mar
'10
3:43 p.m.
This phenomenon shows up in NHTS as well and appears to be a very real result of the fact
that some share of folks used borrowed cars for travel. It may be a young adult who
doesn't own a car but has one available from dad, folks renting, folks borrowing etc.
In consumer expenditure surveys non-car owning households also have non trival auto
related expenses for travel. While I can't confirm that there are errors in the
data, it is not uncommon for non-car households to travel more PMT in SOV than on transit.
Steven E. Polzin, PhD
Director, Mobility Policy
Center for Urban Transportation Research
polzin(a)cutr.usf.edu
(813) 974-9849 (w)
813 416-7517 (c)
-----Original Message-----
From: ctpp-news-bounces(a)chrispy.net [mailto:ctpp-news-bounces@chrispy.net] On Behalf Of Ed
Christopher
Sent: Tuesday, March 02, 2010 4:22 PM
To: ctpp-news(a)chrispy.net
Subject: Re: [CTPP] No Car but Drive Alone to Work
Hmmmm. We had this problem with the 2000 data and did discover that
there was a problem with how "mode to work" was being imputed when that
question was not completed by the respondent. At that time we learned
that the problem had something to do with the order in which things got
imputed. However, how and the order in which things got imputed got
changed to alleviate the problem we saw in 2000. Hopefully those in
Bureau who are on this list might take a look and address what could be
going on.
Simple reasons how someone who does not have a vehicle available could
be driving to work is that they have a company car on loan, maybe a zip
car or even using a neighbors car but I would find it hard to believe
this fully explains what you are seeing.
Your attachment didn't come through.
Cook, Cliff wrote:
I'm hoping someone can help me address this
question from a colleague. He put together a table from the 2006-2008 ACS showing mode of
journey to work by vehicles owned and came up with surprisingly large numbers who do not
won a car yet drive alone to work. No doubt, there are a few people who fit this category
but my guess is that this largely is the result of either people misunderstanding the
question or some sort of coding problem. Here is an excerpt from his email ( the Cambridge
here is Cambridge, Massachusetts):
I'm looking at ACS data and specifically at cities and percent workers have no car
available. From that I'm then looking to see how those workers get to work.
The attached worksheet shows my work. What is strange is that it shows for Cambridge
that 6.6% of people without a car available drove alone to work. The percent is similar
to Boston. And NYC has 3.4% of workers with No vehicles available driving alone to work.
So, the question is, how can someone without a vehicle drive to work alone? Do you have
any ideas on this? It could be someone doesn't own a vehicle, but drives a
friend's car to work. Or has no car of their own, but uses a company car to get to
work. But seems like a high number for this.
Can anyone shed any light on this?
Thanks
Cliff Cook
-----------------------------------------------------------------------------
Clifford Cook
Planning Information Manager
Cambridge Community Development Dept.
344 Broadway
Cambridge, MA. 02139
617/349-4656 FAX 617/349-4669 TTY 617/349-4621
email => ccook(a)cambridgema.gov
web site => <http://www.cambridgema.gov/~CDD/>
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Ed Christopher
708-283-3534 (V)
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FHWA RC-TST-PLN
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Matteson, IL 60443
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