The findings Alan noted have been consistent over time and are always a little disquieting to someone who happens on them and then loses some confidence in the data. I do think folk underestimate the extent to which car loaning goes on in some sociodemographic groups. Part of the reason those millennials don't own cars is because they are still driving mommy or daddy's car. Using extended family member, friends or neighbors vehicles is quite common in many areas. Yes it would be nice if we had data confirmation.
Steve Polzin
-----Original Message-----
From: ctpp-news-bounces(a)chrispy.net [mailto:ctpp-news-bounces(a)chrispy.net] On Behalf Of Ken.Cervenka(a)dot.gov
Sent: Friday, July 24, 2015 2:49 PM
To: ctpp-news(a)chrispy.net
Subject: Re: [CTPP] Commuters Who Drive Alone but Do Have Access to a Vehicle
I don't have clear "facts" to share at my fingertips, but this kind of situation occurs in other survey environments as well. I suspect Alan's thoughts are somewhat correct, but it would sure be nice to back this up with examples from personal interview surveys (in-the-field intercepts or CATI approaches) where there was a "logic check" for occurrences where a person indicated they drove alone, but yet they previously answered a "vehicles in the household" question by saying none. So a well-done logic check might at least prompt the interviewer to ask for a clarification. I am, however, not aware of this actually being fielded.
-----Original Message-----
From: ctpp-news-bounces(a)chrispy.net [mailto:ctpp-news-bounces(a)chrispy.net] On Behalf Of ALANPISARSKI
Sent: Thursday, July 23, 2015 9:51 AM
To: ctpp-news(a)chrispy.net
Subject: Re: [CTPP] Commuters Who Drive Alone but Do Have Access to a Vehicle
This has been around too long to be explained by car2go or others like it but it may be adding to the numbers. We have often just attributed it to using friends' cars or uncle Harry's. some may interpret the census question which asks about household vehicles available as not pertaining to a company car. Depends how they interpret family or available. We have seen the rise in this and in "Other" with the Census unable to explain it or give greater info for us to interpret. We need a small study of "Other". I have interpreted Other to be, e.g., a school bus driver who brings the bus
home-but it's not a household vehicle available. AEP
-----Original Message-----
From: ctpp-news-bounces(a)chrispy.net [mailto:ctpp-news-bounces(a)chrispy.net]
On Behalf Of Greta Ryan
Sent: Thursday, July 23, 2015 9:26 AM
To: ctpp-news(a)chrispy.net
Subject: Re: [CTPP] Commuters Who Drive Alone but Do Have Access to a Vehicle
No, he didn't give any numbers he was just explaining how car sharing works and what someone could use it for. He didn't explicitly say it was happening. You could probably talk with the car share company in Cambridge.
I would think they would be interested in your situation.
-----Original Message-----
From: ctpp-news-bounces(a)chrispy.net [mailto:ctpp-news-bounces(a)chrispy.net]
On Behalf Of Cook, Cliff
Sent: Thursday, July 23, 2015 9:10 AM
To: <ctpp-news(a)chrispy.net>
Subject: Re: [CTPP] Commuters Who Drive Alone but Do Have Access to a Vehicle
Greta
Was Nick Hill able to provide any numbers to back this up? We do have a robust car share network in Cambridge so that could be part of the answer.
Cliff
Sent from my iPhone
> On Jul 23, 2015, at 8:52 AM, "Greta Ryan" <GRyan(a)richmondregional.org>
wrote:
>
> Cliff,
> I was just at an ITSVA conference where Nick Hill from Car2Go spoke.
Possibly these people use such a service to commute.
>
> Greta Ryan
>
> Senior Planner
> Richmond Regional Planning District Commission Suite 200
> 9211 Forest Hill Avenue
> Richmond VA 23235
> (804) 323-2033
> Richmond Regional TPO
>
>
>
> -----Original Message-----
> From: ctpp-news-bounces(a)chrispy.net
> [mailto:ctpp-news-bounces(a)chrispy.net]
On Behalf Of Cook, Cliff
> Sent: Thursday, July 23, 2015 8:41 AM
> To: ctpp-news(a)chrispy.net
> Cc: Krause, Henry
> Subject: [CTPP] Commuters Who Drive Alone but Do Have Access to a
> Vehicle
>
> We are preparing an analysis of the 2006-10 CTPP flow data to support
> our
transportation planning program. An issue that has come up is that we are seeing a small but noticeable proportion of commuters who state they have 0 vehicles available but whose primary commute mode is driving alone. Aside from the obvious explanation of making a mistake when completing the ACS survey can anyone provide thoughts on how we might explain this anomaly?
>
> Thanks
>
> Cliff Cook
>
> Clifford Cook, Planning Information Manager Cambridge Community
Development Department
> 344 Broadway, Cambridge, MA. 02139
>
> www.cambridgema.gov/CDD
> ccook(a)cambridgema.gov
> M: 8:30-8:00 T-Th: 8:30-5:00 F: 8:30-Noon
> 617/349-4656
> 617/349-4669 FAX
> 617/349-4621 TTY
>
>
>
>
>
> _______________________________________________
> ctpp-news mailing list
> ctpp-news(a)chrispy.net
> https://www.chrispy.net/mailman/listinfo/ctpp-news
>
>
> _______________________________________________
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> ctpp-news(a)chrispy.net
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This has been around too long to be explained by car2go or others like it
but it may be adding to the numbers. We have often just attributed it to
using friends' cars or uncle Harry's. some may interpret the census question
which asks about household vehicles available as not pertaining to a company
car. Depends how they interpret family or available. We have seen the rise
in this and in "Other" with the Census unable to explain it or give greater
info for us to interpret. We need a small study of "Other". I have
interpreted Other to be, e.g., a school bus driver who brings the bus
home-but it's not a household vehicle available. AEP
-----Original Message-----
From: ctpp-news-bounces(a)chrispy.net [mailto:ctpp-news-bounces(a)chrispy.net]
On Behalf Of Greta Ryan
Sent: Thursday, July 23, 2015 9:26 AM
To: ctpp-news(a)chrispy.net
Subject: Re: [CTPP] Commuters Who Drive Alone but Do Have Access to a
Vehicle
No, he didn't give any numbers he was just explaining how car sharing works
and what someone could use it for. He didn't explicitly say it was
happening. You could probably talk with the car share company in Cambridge.
I would think they would be interested in your situation.
-----Original Message-----
From: ctpp-news-bounces(a)chrispy.net [mailto:ctpp-news-bounces(a)chrispy.net]
On Behalf Of Cook, Cliff
Sent: Thursday, July 23, 2015 9:10 AM
To: <ctpp-news(a)chrispy.net>
Subject: Re: [CTPP] Commuters Who Drive Alone but Do Have Access to a
Vehicle
Greta
Was Nick Hill able to provide any numbers to back this up? We do have a
robust car share network in Cambridge so that could be part of the answer.
Cliff
Sent from my iPhone
> On Jul 23, 2015, at 8:52 AM, "Greta Ryan" <GRyan(a)richmondregional.org>
wrote:
>
> Cliff,
> I was just at an ITSVA conference where Nick Hill from Car2Go spoke.
Possibly these people use such a service to commute.
>
> Greta Ryan
>
> Senior Planner
> Richmond Regional Planning District Commission Suite 200
> 9211 Forest Hill Avenue
> Richmond VA 23235
> (804) 323-2033
> Richmond Regional TPO
>
>
>
> -----Original Message-----
> From: ctpp-news-bounces(a)chrispy.net [mailto:ctpp-news-bounces(a)chrispy.net]
On Behalf Of Cook, Cliff
> Sent: Thursday, July 23, 2015 8:41 AM
> To: ctpp-news(a)chrispy.net
> Cc: Krause, Henry
> Subject: [CTPP] Commuters Who Drive Alone but Do Have Access to a Vehicle
>
> We are preparing an analysis of the 2006-10 CTPP flow data to support our
transportation planning program. An issue that has come up is that we are
seeing a small but noticeable proportion of commuters who state they have 0
vehicles available but whose primary commute mode is driving alone. Aside
from the obvious explanation of making a mistake when completing the ACS
survey can anyone provide thoughts on how we might explain this anomaly?
>
> Thanks
>
> Cliff Cook
>
> Clifford Cook, Planning Information Manager Cambridge Community
Development Department
> 344 Broadway, Cambridge, MA. 02139
>
> www.cambridgema.gov/CDD
> ccook(a)cambridgema.gov
> M: 8:30-8:00 T-Th: 8:30-5:00 F: 8:30-Noon
> 617/349-4656
> 617/349-4669 FAX
> 617/349-4621 TTY
>
>
>
>
>
> _______________________________________________
> ctpp-news mailing list
> ctpp-news(a)chrispy.net
> https://www.chrispy.net/mailman/listinfo/ctpp-news
>
>
> _______________________________________________
> ctpp-news mailing list
> ctpp-news(a)chrispy.net
> https://www.chrispy.net/mailman/listinfo/ctpp-news
_______________________________________________
ctpp-news mailing list
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http://apdu.org/2015/06/18/measuring-america-on-the-move-free-and-accessibl…
I have organized a webinar for APDU. There will be 3 topics:
1. Census Transportation Planning Products (CTPP) -- Penelope Weinberger, AASHTO
2. National Household Travel Survey (NHTS) -- Adella Santos, FHWA and Jasmy Methipara, Macrosys
3. Transportation Secure Data Center (TSDC) -- Jeff Gonder, NREL
This webinar is FREE for APDU members, otherwise it is $50 for non-members.
FHWA and BTS have long been members of APDU. Hope you will attend!
Also, the APDU annual conference is coming up on September 1-2. http://apdu.org/wp-content/uploads/2015/01/APDU_2015_Annual_Conference_Agen…
Elaine Murakami
FHWA Office of Planning
206-220-4460 (in Seattle)
I've had a suspicion, but I haven't tested it...
My suspicion is: Some share of people misunderstand ACS question #32 and decide that "rode to work" does not include the driver.
I asked Census Bureau staff last winter... They don't know why.
From: Sarah K Heimel (CENSUS/DSSD FED) [mailto:Sarah.K.Heimel(a)census.gov]
Sent: Tuesday, January 06, 2015 5:33 PM
To: Graham, Todd
Subject: Re: ACS questionnaire wording
Hi Todd,
I hope you had an enjoyable holiday. I spoke with the Census subject matter expert on commuting statistics about your question from last month. He said that they are aware of the same anomaly that you and the transportation planners have seen, which has apparently been appearing in the data for a while now, at least since 2000. He thus ruled out my hypothesis of the emerging car-sharing option.
In 2006, Census modified the allocation algorithm slightly to jointly assess these two variables when in need of allocation. Still, there seems to be a lot of people who legitimately chose both no vehicles available and drove alone. We are not currently aware of cognitive test results showing an issue with the wording on Question 32. This is on the list of things to research, to hopefully gain insight into who these people are and what the confusion might be. For now though, I unfortunately cannot give you an answer.
Best,
Sarah
Sarah K. Heimel
Mathematical Statistician
Decennial Statistical Studies Division
U.S. Census Bureau
202-384-8548
________________________________
From: Graham, Todd <todd.graham(a)metc.state.mn.us<mailto:todd.graham(a)metc.state.mn.us>>
Sent: Thursday, December 18, 2014 11:21 AM
To: Sarah K Heimel (CENSUS/DSSD FED)
Subject: ACS questionnaire wording
By the way Sarah... is there a team in ACSO that evaluates question wording and quality of response accuracy (or: risk of respondent error)?
If so can you forward this on?
I was asked earlier this month about commute mode cross-tabbed with "number of vehicles." Transportation planners are asking: how are there so many workers driving to work alone when they live in zero-vehicle households?
I speculated: there could be some respondent error accruing to one of the JTW questions?
The commute mode questions on the questionnaire are:
* #31. How did this person usually get to work LAST WEEK?
* #32. How many people, including this person, usually rode to work in the car, truck, or van LAST WEEK?
If a respondent perceives a difference between being a passenger vs a driver - and thus "rode to work" vs "drove to work" - then he/she could underreport the number of vehicle occupants by -1.
What does ACSO think about respondent error on question #32.
Are there high-occupancy carpools that are being misreported as single-occupancy?
Let me know if there's any answer - thanks for your attention to this.
[EMAILLOGO.png]
Todd Graham
Principal Forecaster | Metropolitan Council | Regional Policy and Research
todd.graham(a)metc.state.mn.us<mailto:todd.graham(a)metc.state.mn.us>
P. 651.602.1322 | F. 651.602.1674
390 North Robert Street | St. Paul, MN 55101 | metrocouncil.org/data<http://www.metrocouncil.org/data>
[ConWUs][FaceBook_32x32]<http://www.facebook.com/MetropolitanCouncil>[Twitter_32x32]<http://twitter.com/#!/metcouncilnews>[Youtube_32x32]<http://www.youtube.com/user/MetropolitanCouncil> [EmailSU] <https://public.govdelivery.com/accounts/MNORGMETC/subscribers/new?preferenc…>
We are preparing an analysis of the 2006-10 CTPP flow data to support our transportation planning program. An issue that has come up is that we are seeing a small but noticeable proportion of commuters who state they have 0 vehicles available but whose primary commute mode is driving alone. Aside from the obvious explanation of making a mistake when completing the ACS survey can anyone provide thoughts on how we might explain this anomaly?
Thanks
Cliff Cook
Clifford Cook, Planning Information Manager
Cambridge Community Development Department
344 Broadway, Cambridge, MA. 02139
www.cambridgema.gov/CDDccook(a)cambridgema.gov
M: 8:30-8:00 T-Th: 8:30-5:00 F: 8:30-Noon
617/349-4656
617/349-4669 FAX
617/349-4621 TTY
I'm not sure car shares can explain this, because Cambridge (and other
cities that use car share a lot) are not unique in this problem. Out of
curiosity I pulled out B08141 2011-2013 (Means of Transportation to Work
by Vehicles Available) by place. I looked at the percent of all workers
who drove alone but who said they have no car.
Range 0%-6.8%
Median 0.92%
Mean 1%
Cambridge 1%
Boston 1.6%
Here are the top 5 with this anomaly. I don't know anything about car
share availability in these areas. It would be interesting to see if
there is a relationship.
Perth Amboy city, New Jersey
New Bern city, North Carolina
Glen Cove city, New York
Middle River CDP, Maryland
Daytona Beach city, Florida
Mara Kaminowitz, GISP
GIS Coordinator
.........................................................................
Baltimore Metropolitan Council
Offices @ McHenry Row
1500 Whetstone Way
Suite 300
Baltimore, MD 21230
410-732-0500 ext. 1030
mkaminowitz(a)baltometro.orgwww.baltometro.org
-----Original Message-----
From: ctpp-news-bounces(a)chrispy.net [mailto:ctpp-news-bounces(a)chrispy.net]
On Behalf Of Greta Ryan
Sent: Thursday, July 23, 2015 8:51 AM
To: ctpp-news(a)chrispy.net
Subject: Re: [CTPP] Commuters Who Drive Alone but Do Have Access to a
Vehicle
Cliff,
I was just at an ITSVA conference where Nick Hill from Car2Go spoke.
Possibly these people use such a service to commute.
Greta Ryan
Senior Planner
Richmond Regional Planning District Commission Suite 200
9211 Forest Hill Avenue
Richmond VA 23235
(804) 323-2033
Richmond Regional TPO
-----Original Message-----
From: ctpp-news-bounces(a)chrispy.net [mailto:ctpp-news-bounces(a)chrispy.net]
On Behalf Of Cook, Cliff
Sent: Thursday, July 23, 2015 8:41 AM
To: ctpp-news(a)chrispy.net
Cc: Krause, Henry
Subject: [CTPP] Commuters Who Drive Alone but Do Have Access to a Vehicle
We are preparing an analysis of the 2006-10 CTPP flow data to support our
transportation planning program. An issue that has come up is that we are
seeing a small but noticeable proportion of commuters who state they have
0 vehicles available but whose primary commute mode is driving alone.
Aside from the obvious explanation of making a mistake when completing the
ACS survey can anyone provide thoughts on how we might explain this
anomaly?
Thanks
Cliff Cook
Clifford Cook, Planning Information Manager Cambridge Community
Development Department
344 Broadway, Cambridge, MA. 02139
www.cambridgema.gov/CDDccook(a)cambridgema.gov
M: 8:30-8:00 T-Th: 8:30-5:00 F: 8:30-Noon
617/349-4656
617/349-4669 FAX
617/349-4621 TTY
_______________________________________________
ctpp-news mailing list
ctpp-news(a)chrispy.nethttps://www.chrispy.net/mailman/listinfo/ctpp-news
_______________________________________________
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But, was it this robust in 2006-2010?
James Garner
Manager, Research & Analysis
Strategic Services Department
Pace Suburban Bus
550 West Algonquin Road
Arlington Heights, IL 60005
847.228.2307
-----Original Message-----
From: ctpp-news-bounces(a)chrispy.net [mailto:ctpp-news-bounces(a)chrispy.net] On Behalf Of Greta Ryan
Sent: Thursday, July 23, 2015 8:26 AM
To: ctpp-news(a)chrispy.net
Subject: Re: [CTPP] Commuters Who Drive Alone but Do Have Access to a Vehicle
No, he didn't give any numbers he was just explaining how car sharing works and what someone could use it for. He didn't explicitly say it was happening. You could probably talk with the car share company in Cambridge. I would think they would be interested in your situation.
-----Original Message-----
From: ctpp-news-bounces(a)chrispy.net [mailto:ctpp-news-bounces(a)chrispy.net] On Behalf Of Cook, Cliff
Sent: Thursday, July 23, 2015 9:10 AM
To: <ctpp-news(a)chrispy.net>
Subject: Re: [CTPP] Commuters Who Drive Alone but Do Have Access to a Vehicle
Greta
Was Nick Hill able to provide any numbers to back this up? We do have a robust car share network in Cambridge so that could be part of the answer.
Cliff
Sent from my iPhone
> On Jul 23, 2015, at 8:52 AM, "Greta Ryan" <GRyan(a)richmondregional.org> wrote:
>
> Cliff,
> I was just at an ITSVA conference where Nick Hill from Car2Go spoke. Possibly these people use such a service to commute.
>
> Greta Ryan
>
> Senior Planner
> Richmond Regional Planning District Commission Suite 200
> 9211 Forest Hill Avenue
> Richmond VA 23235
> (804) 323-2033
> Richmond Regional TPO
>
>
>
> -----Original Message-----
> From: ctpp-news-bounces(a)chrispy.net [mailto:ctpp-news-bounces(a)chrispy.net] On Behalf Of Cook, Cliff
> Sent: Thursday, July 23, 2015 8:41 AM
> To: ctpp-news(a)chrispy.net
> Cc: Krause, Henry
> Subject: [CTPP] Commuters Who Drive Alone but Do Have Access to a Vehicle
>
> We are preparing an analysis of the 2006-10 CTPP flow data to support our transportation planning program. An issue that has come up is that we are seeing a small but noticeable proportion of commuters who state they have 0 vehicles available but whose primary commute mode is driving alone. Aside from the obvious explanation of making a mistake when completing the ACS survey can anyone provide thoughts on how we might explain this anomaly?
>
> Thanks
>
> Cliff Cook
>
> Clifford Cook, Planning Information Manager Cambridge Community Development Department
> 344 Broadway, Cambridge, MA. 02139
>
> www.cambridgema.gov/CDD
> ccook(a)cambridgema.gov
> M: 8:30-8:00 T-Th: 8:30-5:00 F: 8:30-Noon
> 617/349-4656
> 617/349-4669 FAX
> 617/349-4621 TTY
>
>
>
>
>
> _______________________________________________
> ctpp-news mailing list
> ctpp-news(a)chrispy.net
> https://www.chrispy.net/mailman/listinfo/ctpp-news
>
>
> _______________________________________________
> ctpp-news mailing list
> ctpp-news(a)chrispy.net
> https://www.chrispy.net/mailman/listinfo/ctpp-news
_______________________________________________
ctpp-news mailing list
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_______________________________________________
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Greta
Was Nick Hill able to provide any numbers to back this up? We do have a robust car share network in Cambridge so that could be part of the answer.
Cliff
Sent from my iPhone
> On Jul 23, 2015, at 8:52 AM, "Greta Ryan" <GRyan(a)richmondregional.org> wrote:
>
> Cliff,
> I was just at an ITSVA conference where Nick Hill from Car2Go spoke. Possibly these people use such a service to commute.
>
> Greta Ryan
>
> Senior Planner
> Richmond Regional Planning District Commission
> Suite 200
> 9211 Forest Hill Avenue
> Richmond VA 23235
> (804) 323-2033
> Richmond Regional TPO
>
>
>
> -----Original Message-----
> From: ctpp-news-bounces(a)chrispy.net [mailto:ctpp-news-bounces(a)chrispy.net] On Behalf Of Cook, Cliff
> Sent: Thursday, July 23, 2015 8:41 AM
> To: ctpp-news(a)chrispy.net
> Cc: Krause, Henry
> Subject: [CTPP] Commuters Who Drive Alone but Do Have Access to a Vehicle
>
> We are preparing an analysis of the 2006-10 CTPP flow data to support our transportation planning program. An issue that has come up is that we are seeing a small but noticeable proportion of commuters who state they have 0 vehicles available but whose primary commute mode is driving alone. Aside from the obvious explanation of making a mistake when completing the ACS survey can anyone provide thoughts on how we might explain this anomaly?
>
> Thanks
>
> Cliff Cook
>
> Clifford Cook, Planning Information Manager Cambridge Community Development Department
> 344 Broadway, Cambridge, MA. 02139
>
> www.cambridgema.gov/CDD
> ccook(a)cambridgema.gov
> M: 8:30-8:00 T-Th: 8:30-5:00 F: 8:30-Noon
> 617/349-4656
> 617/349-4669 FAX
> 617/349-4621 TTY
>
>
>
>
>
> _______________________________________________
> ctpp-news mailing list
> ctpp-news(a)chrispy.net
> https://www.chrispy.net/mailman/listinfo/ctpp-news
>
>
> _______________________________________________
> ctpp-news mailing list
> ctpp-news(a)chrispy.net
> https://www.chrispy.net/mailman/listinfo/ctpp-news