ctpp-news July 2015

ctpp-news@mailman.chrispy.net

20 participants
5 discussions

Commuters Who Drive Alone but Do Have Access to a Vehicle

by Cook, Cliff

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

9 years, 3 months

Association of Public Data Users (APDU) webinar on Weds, July 29

by Elaine.Murakami＠dot.gov

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)

9 years, 3 months

Re: [CTPP] Commuters Who Drive Alone but Do Have Access to a Vehicle

by Graham, Todd

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@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@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@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…>

9 years, 3 months

Fun with LEHD

by Mara Kaminowitz

http://www.washingtonpost.com/blogs/wonkblog/wp/2015/07/14/nearly-every-job… http://www.robertmanduca.com/projects/jobs.html *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.org www.baltometro.org

9 years, 3 months

1959 Chicago Area Transportation Study : final report in three parts : Chicago Area Transportation Study. : Free Download & Streaming : Internet Archive

by Krishnan Viswanathan

I know some people on this list will find this interesting. https://archive.org/details/chicagoareatrans01chic Enjoy.

9 years, 4 months

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ctpp-news July 2015