|Federal Highway Administration Metropolitan Planning Division and Office of Highway Information Mgt Federal Transit Administration In cooperation with the TRB Subcommittee on Census Data for Transportation Planning||
Message from the Chair
CTPP 2000 Funding
The next step in the process is for the resolution to be approved by AASHTO's Executive Board. It is scheduled to be voted on at the November Board of Director's Meeting.
Once approved, the process would be similar to that used for the 1990 CTPP production. The cost of the CTPP 2000 program for each state would be 1.1-cents per person (using Census' July 2000 State Population Projections). The 1990 CTPP cost was 1-cent per person.
The current goal is to have comments back from the Urban and Statewide Data Committees by the end of October for a "2nd Draft", then send out to all State DOTs and MPOs for their comments later this Fall. The "3rd Draft", or near final, version would then be discussed at January's TRB Annual Meeting before being finalized and submitted to the Census Population Division.
"Alpha test" - October 15: copies to be loaded onto operating systems at DOT (Tom Mank, Elaine Murakami, Jerry Everett and Wende O'Neill), the Census Bureau (Phil Salopek and Todd Blair), and CATS (Ed Christopher) for their review and comments.
"Beta Test" - November 20: copies to two MPOs for their review and comments. The two MPOs who have agreed to "beta" test the TAZ-UP process are Northeast Ohio Areawide Coordinating Agency (Cleveland) and Capitol Region Council of Governments (Hartford).
A letter will be sent to all FHWA Division Offices requesting information on their respective MPOs / DOTs' system capabilities for performing "digital" updates and submittals of TAZ delineations for their region. If the agency does have the capability to provide digital TAZ submittals, they are asked whether or not they will need a copy of ArcView 3.1, which will be supplied to those agencies who don't already have it. [See related article in this newsletter]
|In the past few months, information on MPO GIS software usage has been assembled at FHWA from a number of sources: the CTPP 2000 Status Report questionnaires, AMPO's "1998 Profiles of MPOs", AMPO's 1998 GIS Survey and phone interviews. To the right is a summary of the reported data (from the 261 of 341 MPOs responding)||
1. How did the 1990 census classify job activity/kind of work?
The 1990 census recognized three dimensions:
2. How has census data on kind of work supported transportation planning?
Problems in locating jobs:
The biggest change is the North American Industry Classification System (NAICS). Facts about NAICS:
5. What new problems does Census 2000 present for employment data about kind of work?
A. Assigning appropriate NAICS-based codes: Census 2000 industry questions are nearly identical to those of 1990. Many workers in what SIC called auxiliaries - the administrative offices, warehouses, research and development facilities, etc. that support the operations of a firm's other establishments - will give a "big picture" answer describing the firm's overall purpose. However, NAICS requires that such workers be assigned to such classes as "Management of Companies and Enterprises," "Warehousing," "Research and Development," etc.
B. Noncomparability of employment by industrial class, 1990 vs. 2000: Since 1990 census industrial codes are SIC-based, and 2000 census codes will be NAICS-based, 1990 and 2000 employment by industry class will not be comparable.
C. Land use class is still to some extent a missing dimension. NAICS is a major improvement in employment data, in that its classes correspond much better to land use types, including those of the ITE Traffic Generation manual. However, a minority of NAICS classes (e.g., construction, wholesale trade, educational services) still mix land uses.
6. What new opportunities does Census 2000 present for employment data about kind of work?
A. Correct assignment of NAICS codes. The Census Bureau plans to match employer names and workplace addresses given in Census 2000 questionnaire responses against an employer/establishment list, and thereby directly assign NAICS codes. For unmatchable or missing responses, NAICS codes could be imputed using kind of work and workplace location.
B. Comparability of employment by industrial class, 1990 and 2000. If the list used for matching has both SIC and NAICS codes, workers can be automatically double coded, and then facilitate double coding of unmatchable workers.
C. A full classification of workers by land use class. Use NAICS where unequivocal regarding land use, and imputation based upon industry, occupation, and class of worker for the remaining cases.
7. What does transportation planning need?
Census 2000 employment data could meet these objectives:
A. Correct geocoding: Achieve a higher rate of tract/block geocoding, supplemented by a fallback geocoding procedure by whole TAZs (traffic analysis zones).
B. Accurate Allocation: For ungeocodable workers, use an improved allocation procedure that makes maximum use of trip characteristics and detailed industrial class, occupational class, and class of worker.
C. 1990 to 2000 comparability: Classify Census 2000 employment to an SIC-based system, to allow comparison to 1990, or else (considering 1990 shortcomings) assign NAICS codes to 1990 census records, using imputation based upon worker characteristics.
D. Correct NAICS-based classification: Use a method that correctly codes workers to NAICS.
E. Land use classification: Use NAICS, plus other data items, to assign land use classes to all workers.
For information on improving the geographic allocation of ungeocodable workers and on assigning land use classes to workers in the decennial census see Ed Limoges' two papers in Conference Proceedings 13 - Decennial Census Data for Transportation Planning: Case Studies and Strategies for 2000, Volume 2: Case Studies, Transportation Research Board, National Research Council, Washington, DC, 1997, pp. 33-57.
The above is an abbreviated version of an article which appeared in the American Planning Association's latest Transportation Division Newsletter.
The Uses of the 1990 CTPP Data
|COMSIS Corporation. Transportation Planner's Handbook on Conversion Factors for the Use of Census Data, Publication No. FHWA-PD-96-030. Washington, DC: U.S. Dept. Of Transportation, [May 1996]||Transportation Research Board / National Research Council. Decennial Census Data for Transportation Planning: Case Studies and Strategies for 2000 - Volume 2 - Case Studies (Conference Proceedings 13), Publication No. ISBN 0-309-05970-4. Washington, DC: National Academy Press, |
|JHK & Associates. CTPP Handbook: An Instructional Guide to the 1990 Census Transportation Planning Package, Publication No. FHWA-PD-95-019. Washington, DC: U.S. Dept. Of Transportation, [February 1995]||Transportation Research Board / National Research Council. Proceedings of the National Conference on Decennial Census Data for Transportation Planning, Special Report 206. Washington, DC: Transportation Research Board / National Research Council, |
|JHK & Associates. Using 1990 Census Data to Support Transportation Planning and Policy Development - An Overview of the CTPP, Publication No. FHWA-PD-94-036. Washington, DC: U.S. Dept. Of Transportation, ||Transportation Research Board / National Research Council. Census Data and Urban Transportation Planning in the 1980s, Publication No. ISBN 0-309-03763-8. Washington, DC: Transportation Research Board / National Research Council, |
|Rossetti, Michael A. and Barbara S. Eversole. Journey-To-Work Trends in the United States and its Major Metropolitan Areas: 1960-1990, Publication No. FHWA-PL-94-012. Washington, DC: U.S. Dept. Of Transportation, ||Transportation Research Board / National Research Council. Information Needs to Support State and Local Transportation Decision Making into the 21st Century - (Conference Proceedings 14), Publication No. ISBN 0-309-06206-3. Washington, DC: National Academy Press, |
|Transportation Research Board / National Research Council. Decennial Census Data for Transportation Planning (Conference Proceedings 4), Publication No. ISBN 0-309-06055-9. Washington, DC: National Academy Press, ||Transportation Research Board / National Research. Advances in Transportation Data: 1997, Publication No. 1593. Washington, DC: National Academy Press, |
|Transportation Research Board / National Research Council. Decennial Census Data for Transportation Planning: Case Studies and Strategies for 2000 - Volume 1 (Conference Proceedings 13), Publication No. ISBN 0-309-05965-8. Washington, DC: National Academy Press, ||U.S. Dept. Of Transportation, Federal Highway Administration, Office of Policy and Office of Highway Information Management. Census Mapbook for Transportation Planning, Publication No. FHWA-PL-94-035. Washington, DC: U.S. Dept. Of Transportation, [December 1994]|
|Transportation Research Board / National Research Council. Transit Markets of the Future - The Challenge of Change, TCRP Project H-4B Washington, DC: Transportation Research Board / National Research Council, [February 1997]|
I opened the meeting by distributing the minutes from our inaugural
meeting in January. Officially, our minutes are distributed as part of
the minutes of our parent committee (Committee on Urban Data and Information
Systems), but they can also be accessed at:
We then acknowledged the CTPP 2000 Planning Group that has representatives on it from FHWA, FTA, BTS and the Census Bureau and has been meeting on a regular basis since February, 1998 to scope out the CTPP 2000. As readers of the CTPP 2000 Status Report know, this group has been very active planning the CTPP 2000 package and purchase, the TAZ definition program and work place coding.
Following our introductions, Bob LaMacchia of the Census Bureau Geography Division presented us with an overview of the Census 2000 plans and distributed copies of the Dress Rehearsal and American Community Survey (ACS) questionnaire forms. One item of note that the Subcommittee will be watching is the wording of the transportation questions on the ACS. It was noted that on the ACS questionnaire form, all the public transportation submodes are grouped under one box called "public transportation". On the Dress Rehearsal form, the transportationrelated questions were exactly as they had been reported in past issues of the CTPP 2000 Status Report.
After Bob assured us that there would be a 2000 Census, we discussed the CTPP 2000 Package and its purchase. Jerry Everett, FHWA, informed us that in June, the AASHTO Standing Committee on Planning (SCOP) passed a resolution to coordinate the purchase of the 2000 CTPP tabulations through the pooled fund process. This resolution will next go to the AASHTO Executive Committee for their approval. Following up on this purchase, Elaine Murakami, FHWA, and I discussed the process and items to be considered when determining the content of CTPP 2000.
Other issues discussed included the TAZ definition program lead by Elaine
Murakami; work place geocoding by Jerry Everett; the new employment classification
system, NAICS by Ed Limoges, Southeast Michigan Council of Governments
(note his article starting on page 3 of this report); and, the activities
underway regarding the American Community Survey. More detailed information
on these and many more issues can be found in past issues of the CTPP 2000
Status Report located on our web site at:
Finally, those who are interested in keeping apprised of the CTPP 2000 activities are encouraged to join our electronic mailing list by sending an E-mail to email@example.com with the words "subscribe ctppnews" in the body of the message.
Chair, Subcommittee on Census Data for Transportation Planning
Participating MPOs / DOTs will receive a version of TIGER/Line98 file for digitizing changes / additions to their TAZs and, after running the step-by-step processes in "TAZ-UP", will end up with a polygon-to-TAZ equivalency file in the appropriate format submit to the Census Geography Division.
Just Clcik Here.
|"Surf's Up" Web Sites to Remember|
|Ed Christopher (Census Subcommittee Chair)
|Chuck Purvis (Urban Data Committee Chair)
|Ed Limoges (Census Subcommittee Secretary)
|Ron Tweedie (State Data Committee Chair)
Census Population Division (JTW questions)
Census Geography Division (for TAZ update questions)
|Tom Mank (2000 CTPP Status questions)
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