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Diana Portillo is out of the office.

by Diana Portillo

I will be out of the office starting 11/21/2008 and will not return until 11/25/2008.

16 years, 1 month

Re: [CTPP] WEB TRAINING to Review Census Bureau data accesstools for ACS data : Dec 2 and 5

by pmission＠srpedd.org

I will be out of the office from Nov 21st to Dec. 8th. If you need immediate assistance, please contact SRPEDD.

16 years, 1 month

(no subject)

by Ayalew Adamu

Thank You. Ayalew Adamu, PhD. Chief Statewide Travel Analysis Branch Division of Transportation System Information 916-653-2840 Ayalew.Adamu(a)DOT.CA.Gov

16 years, 1 month

CTPP Tables for Small Geographic Areas

by Harry P Wolfe

Will there be CTPP Tables prepared for areas of 65,000 people or more, or for areas of 20,000 people or more? If so, when would that occur? Sincerely Harry P. Wolfe

16 years, 1 month

RE: A Question - work flow vs. HBW trip rate

by Binbin Chen

Elaine and Ed, Thank you very much for your answers. They are very helpful. One more question on this issue. In Eric's explanation- "Using a factor of 1.5, 1,000 employees would generate 1,500 HBW trips; then you'd need to divide by two to approximate a CTPP-derived home-to-work trip, giving you 750 trips." Does he mean comparing "750 trip" to the "CTPP workers" ? Thanks a lot! Binbin -----Original Message----- From: ctpp-news-bounces(a)chrispy.net [mailto:ctpp-news-bounces@chrispy.net] On Behalf Of ctpp-news-request(a)chrispy.net Sent: Saturday, November 08, 2008 12:00 PM To: ctpp-news(a)chrispy.net Subject: ctpp-news Digest, Vol 57, Issue 2 Send ctpp-news mailing list submissions to ctpp-news(a)chrispy.net To subscribe or unsubscribe via the World Wide Web, visit http://www.chrispy.net/mailman/listinfo/ctpp-news or, via email, send a message with subject or body 'help' to ctpp-news-request(a)chrispy.net You can reach the person managing the list at ctpp-news-owner(a)chrispy.net When replying, please edit your Subject line so it is more specific than "Re: Contents of ctpp-news digest..." Today's Topics: 1. Re: ctpp-news Digest, Vol 57, Issue 1 (Out Of Office Auto Message) (John Posey) 2. RE: A Question - work flow vs. HBW trip rate (Murakami, Elaine) 3. Re: A Question - work flow vs. HBW trip rate (Ed Christopher) 4. Quick TAZ Update (Ed Christopher) 5. Diana Portillo is out of the office. (Diana Portillo) ---------------------------------------------------------------------- Message: 1 Date: Fri, 07 Nov 2008 12:04:59 -0600 From: "John Posey" <john.posey(a)ewgateway.org> Subject: [CTPP] Re: ctpp-news Digest, Vol 57, Issue 1 (Out Of Office Auto Message) To: <ctpp-news(a)chrispy.net> Message-ID: <s9142ef8.080(a)nws-ewg4.ewgateway.org> Content-Type: text/plain; charset=US-ASCII I will be out of the office until November 17. Please contact Hilary Perkins if you need assistance before then. ------------------------------ Message: 2 Date: Fri, 7 Nov 2008 11:27:29 -0800 From: "Murakami, Elaine" <Elaine.Murakami(a)fhwa.dot.gov> Subject: RE: [CTPP] A Question - work flow vs. HBW trip rate To: <ctpp-news(a)chrispy.net> Message-ID: <195CBC4D6D4C1547BFCE1198D7D6633977AA51(a)fhxwa4.fhwa1.fhwa.dot.gov> Content-Type: text/plain; charset="us-ascii" Yes, the CTPP 2000 uses the Census 2000 and provides a count of WORKERS AT WORK. Workers at work is generally at least 10 percent lower than employment or jobs. Also, the Census 2000 allows a response for only 1 job per worker. http://www.fhwa.dot.gov/ctpp/ctppatwork.htm NCHRP 365 used results from regional household travel surveys AND the 1990 NPTS. (Page 23) You might want to take a look at the NHTS transferability project that FHWA completed a few years ago. http://nhts.ornl.gov/tools.shtml The work was done by Oak Ridge National Labs and uses the 2001 NHTS data, and estimates total person trips, total vehicle trips, and trips by purpose at the tract level. You need to understand how trip purpose is coded. I glanced at results for census tracts in one county in Washington State and HBW were about 12% of total trips. Let's say that the overall average number of household trips is 9 or 10, then 12% would be 1.1 to 1.2. The transferability project provides trips rates by household size and vehicle availability. However, it is very important to understand that a trip from WORK to SHOP, and then SHOP to HOME, would not be included as a WORK to HOME (with 1 stop) in the count of HBW trips. This is why, using the concept of TOURS and TRIP CHAINING has become increasingly used in travel demand models. The links below are to Nancy McGuckin's papers (2001 NHTS and 1995 NPTS) on trip chaining: http://www.travelbehavior.us/projects_files/Trip%20Chaining%20Trends%20i n%20the%20US%20TRB%20paper%2005-1716%20(2).pdf http://nhts.ornl.gov/1995/Doc/Chain2.pdf Hope this helps. Elaine Murakami FHWA Office of Planning _____ From: ctpp-news-bounces(a)chrispy.net [mailto:ctpp-news-bounces@chrispy.net] On Behalf Of Binbin Chen Sent: Thursday, November 06, 2008 2:18 PM To: ctpp-news(a)chrispy.net Subject: [CTPP] A Question - work flow vs. HBW trip rate Hi, I'm new in using CTPP data, and am a little confused about the work flow CTPP provided and work trip. Basically, CTPP counts workers, not trip. Then can it be used to compute HBW trip per household? For example, assume 1.5 trips/worker (NCHRP#365), HBW trip/HH = 1.5*workers/household numbers ? And How can CTPP work flow compare to NHTS HBW trip rate? I highly appreciate your help! Best, Binbin

16 years, 2 months

Diana Portillo is out of the office.

by Diana Portillo

I will be out of the office starting 11/07/2008 and will not return until 11/13/2008.

16 years, 2 months

Quick TAZ Update

by Ed Christopher

Earlier this week the AASHTO CTPP Oversight Board met and reached an agreement on TAZs for ACS. MPOs and states wishing to create TAZs will be able to do so during the summer of 2011. This is a change from the previous schedule (spring of 2009) and now gives everyone more time along with the benefit of knowing what the block level 2010 population counts will be when making TAZs. Stay tuned for more details. In other news from the Census Bureau... American Community Survey 2005-2007 Data Release — On Dec. 9, the Census Bureau will release the first set of three-year American Community Survey data for all geographies with populations greater than 20,000. The release will provide the first look at detailed socioeconomic and housing characteristics for geographies between 20,000 and 64,999 since Census 2000. (Data will be embargoed to the media Dec. 4.) -- Ed Christopher 708-283-3534 (V) 708-574-8131 (cell) FHWA RC-TST-PLN 19900 Governors Dr Olympia Fields, IL 60461

16 years, 2 months

A Question - work flow vs. HBW trip rate

by Binbin Chen

Hi, I'm new in using CTPP data, and am a little confused about the work flow CTPP provided and work trip. Basically, CTPP counts workers, not trip. Then can it be used to compute HBW trip per household? For example, assume 1.5 trips/worker (NCHRP#365), HBW trip/HH = 1.5*workers/household numbers ? And How can CTPP work flow compare to NHTS HBW trip rate? I highly appreciate your help! Best, Binbin

16 years, 2 months

Re: ctpp-news Digest, Vol 57, Issue 1 (Out Of Office Auto Message)

by John Posey

I will be out of the office until November 17. Please contact Hilary Perkins if you need assistance before then.

16 years, 2 months

ACS Reference Materials

by Ed Christopher

The Census Bureau just released the first of a series of "handbooks" aimed at helping data users negotiate their way through ACS data. This first handbook, "What General Data Users Need to Know" will help general audiences understand the basics of the ACS, its opportunities and challenges, and how to access and use the ACS data on the Census Bureau's Web site. The handbook can be found at http://www.census.gov/acs/www/Downloads/ACSGeneralHandbook.pdf The handbook itself is part of a much broader suite of e-learning ACS materials that can found at http://www.census.gov/acs/www/UseData/Compass/compass_series.html In addition, NCHRP Report 588 "A Guidebook for Using the American Community Survey Data for Transportation Planning" is a MUST HAVE for the transportation planner. It can be found on-line at http://onlinepubs.trb.org/onlinepubs/nchrp/nchrp_rpt_588.pdf -- Ed Christopher Resource Center Planning Team Federal Highway Administration 19900 Governors Drive Olympia Fields, Illinois 60461 708-283-3534 (V) 708-574-8131 (cell) 708-283-3501 (F)

16 years, 2 months

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