ctpp-news May 2003

ctpp-news@mailman.chrispy.net

7 participants
12 discussions

Calculating commute flow for "Core Based Statistical Areas"

by Elaine Murakami

This information is provided by Todd Gardner Population Distribution Branch, U.S. Census Bureau: The standards for defining CBSAs are given in the Dec. 27, 2000, Federal Register Notice, available on the Census Bureau's website at http://www.census.gov/population/www/estimates/masrp.html. To determine if a county qualifies as an outlying county in a CBSA the following test is employed: Section 3. Outlying Counties A county qualifies as an outlying county of a CBSA if it meets the following commuting requirements: (a) at least 25 percent of the employed residents of the county work in the central county or counties of the CBSA; or (b) at least 25 percent of the employment in the county is accounted for by workers who reside in the central county or counties of the CBSA. A county may appear in only one CBSA. If a county qualifies as a central county of one CBSA and as outlying in another, it falls within the CBSA in which it is a central county. A county that qualifies as outlying to multiple CBSAs falls within the CBSA with which it has the strongest commuting tie, as measured by either (a) or (b) above. The counties included in a CBSA must be contiguous; if a county is not contiguous with other counties in the CBSA, it will not fall within the CBSA. The numbers used in this test come from the 2000 County-to-County Worker Flow Files, available on the Census Bureau's website at http://www.census.gov/population/www/cen2000/commuting.html. The number of employed residents is calculated by adding up all counts of individuals in the 2000 County-to-County Worker Flow Files where the county in question is listed as the county of residence. Similarly, county employment is calculated by adding up all counts in the 2000 County-to-County Worker Flow Files where the county in question is listed as the place of work. If you have any further questions you can contact me at 301-763-2459. --Todd Gardner Population Distribution Branch

21 years, 3 months

RE: County-to-county worker flow data, 2000

by Hartgen, David

Colleagues, Elaine Murakami at FHWA has suggested I contact you. I am working on a county-to-county work flow analysis for North Carolina's 100 counties, and am interested to know if anyone is/has done something similar for cities or for other states or US regions. The issues we are addressing are: 1. Has inter-county commuting increased as a share of trips, VMT, and fuel use since 1990? 2. What percent of state travel and fuel use is in intra- and inter-county commuting? Is it a declining or increasing share? My student (Ellen Cervera) has completed the first phase of her work, for 2000, and is beginning the 1990 analysis. Her problem involves computing, for all NC co-to-co flows (100*100), the % of vehicle trips (adjusted for carpooling), the % of VMT (using a distance matrix and 20 % road circuituity), and % of fuel use (using weighted fuel rates from Hy Statistics VM-1) that is inter-co versus intra-co; also these %'s as a function of total state use, and changes in these %'s from 1990 to 2000. The effects are hypothesized to be compensating: that is, trips are getting longer and the % of travel that is inter-county is increasing, but fuel use is declining per mile, so the magnitude of fuel use in inter-county may be stable or declining over time. My modeling system is TransDAD (http://www.caliper.com) Anyone working on a similar problem with the 2000 county-to-county data? We would appreciate receiving materials at this location or at fax 704-687-3442. Thanks Prof. David T. Hartgen UNC Charlotte 704-687-4308

21 years, 5 months

2000 Worker Flows

by Michael Clarke

To follow-on to David's email about worker flows, Cube 3.1 and Viper/TP+ 3.1 directly develop and display county-to-county flows for 1970, 1980, 1990 and 2000. Further information on these products is available on www.citilabs.com <http://www.citilabs.com/> Michael Clarke

21 years, 5 months

[Fwd: 2000 Worker Flows]

by ed christopher

i am passing this along to the list. i believe that is where michael meant it to go. when posting to the list the list serve address is "ctpp-news(a)chrispy.net". someone along the way slipped the word "owner-" in front of the address which sends the message only to me. also, when responding to the entire list, please make sure to "reply all" to make sure your response goes to the list and not just the person who stimulated the response. -------- Original Message -------- Subject: 2000 Worker Flows Date: Fri, 30 May 2003 08:01:11 -0700 From: "Michael Clarke" <mclarke(a)citilabs.com> To: <owner-ctpp-news(a)chrispy.net> To follow-on to Davids email about worker flows, Cube 3.1 and Viper 3.1 directly develop and display county-to-county flows for 1970, 1980, 1990 and 2000. Further information on these products is available on www.citilabs.com Michael Clarke

21 years, 5 months

[Fwd: RE: CTPP Census Journey to Work Question]

by ed christopher

i am passing this along to the list. i believe that is where frank meant it to go. when posting to the list the list serve address is "ctpp-news(a)chrispy.net". someone along the way slipped the word "owner-" in front of the address which sends the message only to me. also, when responding to the entire list, please make sure to "reply all" to make sure your response goes to the list and not just the person who stimulated the response. -------- Original Message -------- Subject: RE: CTPP Census Journey to Work Question Date: Fri, 30 May 2003 11:42:16 -0400 From: Fred Frank <fred.frank(a)knoxtrans.org> Organization: Knoxville-Knox County MPC To: "'owner-ctpp-news(a)chrispy.net'" <owner-ctpp-news(a)chrispy.net> Hello, The Census data for journey to work is a one-way figure. The Knoxville MSA average for a home to work trip is 23.2 minutes. It would also be representative for a work to home trip, so you could double that figure to get the total time a person would spend traveling to and from work- 46.4 minutes. Hope this helps. Fred Frank Transportation Planner Knoxville Regional Transportation Planning Organization Suite 403, City-County Building 400 Main Street Knoxville, TN 37923 (865) 215-4001 www.knoxtrans.org

21 years, 5 months

Re: [CTPP] Census Journey to Work Question

by Rob CASE

Dan, I understand that the trip home often takes longer because there's more congestion in the pm (because there are more non-work trips being made during pm rush hour than during am rush hour). Rob Robert B. Case, PE, PTOE Principal Transportation Engineer Hampton Roads Planning District Commission 723 Woodlake Dr., Chesapeake, Va. 23320 voice:757-420-8300; fax:757-523-4881 rcase(a)hrpdc.org >>> Estersohn Dan <Dan.Estersohn(a)arbitron.com> 05/28/03 11:38AM >>> I need to get more information on the Journey to Work questions. Can you help me understand why only the one-way home-to-work trip is asked for? Why not the return trip? Is it correct to double the Census travel times to generalize "the average worker spends 51 minutes a day commuting?" I would appreciate your input. The questions arise because we posted the Census data on our web site. We aggregated the data to our geographies and to a more manageable number of categories. As you can imagine; radio stations, outdoor advertising companies, and their ad agency and advertiser clients are very interested in commuting info. If you are interested, you can see the application at <http://www.arbitron.com/radio_stations/transportation.htm> http://www.arbitron.com/radio_stations/transportation.htm. Dan Estersohn Senior Demographer Arbitron, Inc

21 years, 5 months

RE: [CTPP] Census Journey to Work Question

by Murakami, Elaine

Here is a link to the Census "long form" which includes the "journey to work" questions. http://www.census.gov/dmd/www/pdf/d02p.pdf Yes, it only the trip TO work. And, yes, you can double it to approximate a "round trip." Results from the National Household Travel Survey (NHTS) http://nhts.ornl.gov/2001/index.shtml show that many more people STOP on their way home from work, we call this "trip chaining." Results from the 1995 NPTS show that 60% of women, and nearly 50% of men make a stop on their way from work to home. So, the result is the that trip from work to home, including one or 2 stops is often considerably longer than the trip TO work. http://www-cta.ornl.gov/npts/1995/Doc/Chain2.pdf Thank you for sharing the Arbitron application. You may also be interested in the county-level CTPP profiles that were released last October. http://www.fhwa.dot.gov/ctpp/dataprod.htm These have a few tables, including comparisons to 1990 results, and tables of commute time by mode of travel, and vehicle availability by household size. This same link also has information on the Census Bureau's County-to-County worker flow data. The CTPP Part 1 (residence) tables will begin release in a few weeks. They will be mailed initially to the State DOTs and MPOs for their review, before they are released broadly and publicly. Elaine Murakami Federal Highway Administration 206-220-4460

21 years, 5 months

Census Journey to Work Question

by Estersohn Dan

I need to get more information on the Journey to Work questions. Can you help me understand why only the one-way home-to-work trip is asked for? Why not the return trip? Is it correct to double the Census travel times to generalize "the average worker spends 51 minutes a day commuting?" I would appreciate your input. The questions arise because we posted the Census data on our web site. We aggregated the data to our geographies and to a more manageable number of categories. As you can imagine; radio stations, outdoor advertising companies, and their ad agency and advertiser clients are very interested in commuting info. If you are interested, you can see the application at <http://www.arbitron.com/radio_stations/transportation.htm> http://www.arbitron.com/radio_stations/transportation.htm. Dan Estersohn Senior Demographer Arbitron, Inc

21 years, 5 months

Re: [CTPP] American Community Survey - May 13, 2003 Hearing

by Chuck Purvis

TO: CTPP-News; Nathan There were some slight problems in the PDF and WORD files I uploaded to our FTP site. So, I re-up-loaded them to our FTP site, as well as our HTTP (hypertext transfer protocol - - web page) site: ftp://ftp.abag.ca.gov/pub/mtc/census2000/ACS/ACS_Hearing_MAY1303/ http://www.mtc.ca.gov/datamart/census/acs/ If the FTP doesn't work, there may be a "firewall" issue. I wouldn't know if it's from our end or your end. Perhaps your systems administrator could tell. An any case, I've made duplicates of the same file at the http url, shown above. Maybe Ed and I can update trbcensus.com to add links to these documents on the ACS page? Chuck Purvis ************************************************************** Charles L. Purvis, AICP Principal Transportation Planner/Analyst Metropolitan Transportation Commission 101 Eighth Street Oakland, CA 94607-4700 (510) 464-7731 (office) (510) 464-7848 (fax) www: http://www.mtc.ca.gov/ Census WWW: http://www.bayareacensus.ca.gov/ **************************************************************

21 years, 5 months

American Community Survey - May 13, 2003 Hearing

by Chuck Purvis

TO: CTPP-News For the benefit of the CTPP community, I've uploaded all of the testimonies (PDF, Word) from the May 13, 2003 Congressional Subcommittee meeting regarding the American Community Survey, onto our FTP site. The files are available at: ftp://ftp.abag.ca.gov/pub/mtc/census2000/ACS/ACS_Hearing_MAY1303/ Chuck Purvis, MTC ********************************************************************************************************************* May 19, 2003 AMERICAN COMMUNITY SURVEY ALERT Number 14 Informing you about news, events, data releases, congressional actions, and other developments associated with the American Community Survey (ACS). ________________________________________ EVENTS UPDATE ACS Alerts Number 12 and 13 transmitted the testimony from witnesses at the May 13 Congressional hearing on the American Community Survey. In addition to the testimony presented at the hearing, the Department of Veterans Affairs submitted written testimony. The statement for the record from Stephen Meskin, Chief Actuary for the Department of Veterans Affairs is attached.

21 years, 5 months

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ctpp-news May 2003