Subcommittee on Census Data for Transportation Planning
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
C T P P  2 0 0 0  Status Report
October 1998
Tom.Mank@fhwa.dot.gov
Software for Delineating Traffic Analysis Zones (TAZ)
CTPP 2000 Funding

Publications Showcasing CTPP Uses

CTPP 2000 Table Definitions

GIS Software Use Among MPOs

TAZ Update ("TAZ-UP")

Employment Data for Transportation Planning

TRB Subcommittee
Message from the Chair
CTPP Contacts
"Surf's Up"
Tidbits

CTPP 2000 Funding

On June 6, 1998, a policy resolution was passed at the AASHTO Standing Committee on Planning (SCOP) mid-year meeting. The resolution called for a state-sponsored pooled funding arrangement for CTPP 2000. The funds would be used to establish a contract between AASHTO and the Census Bureau for the production of the 2000 CTPP. There was only one dissenting vote.

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.

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CTPP 2000 Table Definitions
Using a detailed list of 1990 CTPP Tabulations and the feedback questionnaires returned by MPOs / DOTs noting what tables they used in 1990, the CTPP Planning Group (with BTS, FHWA, FTA, and Census JTW representatives) generated a list of "Issues to Consider in Determining Content of 2000 CTPP" tables. The 1990 CTPP Tables and the "hot issues" were discussed at TRB's Mid-Year Meeting in Seattle. Ed Christopher (Chair, Subcommittee on Census Data for Transportation Planning) passed the 1990 tables and "hot issues" list onto Chuck Purvis (Committee on Urban Transportation Data and Information Systems) and Ron Tweedie (Committee on Statewide Transportation Data and Information Systems) for their respective committees' review and comments. If you would like to review the "hot issues" yourself, they are posted at Ed's TRB Subcommittee website: "Hot Issues"

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.

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TAZ Update ("TAZ-UP")
The CTPP 2000 Planning Group has decided to use ArcView GIS software, an "add-on" to ArcView, and TIGER/Line98 for the 2000 TAZ updates to be provided to Census Geography Division for CTPP tabulations.  The preliminary schedule for "testing" the "TAZ-UP" software and related processes is as follows:

"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]

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GIS Software Use Among MPOs
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)
GIS Software
Number of
MPOs
Percent
ArcView 
172 
65.9
ArcInfo
162 
62.0
MapInfo
35 
13.4
AtlasGIS
30 
11.5
TransCad
27
10.3
Other 
40 
15.3
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Employment Data for Transportation Planning
Objectives for Census 2000
Edward Limoges, SEMCOG
[NOTE: This article does not reflect US DOT's policy position]
Introduction
This article reviews worker classification in the 1990 census, the role of employment data in transportation planning, and objectives for Census 2000 in a question and answer format.

1. How did the 1990 census classify job activity/kind of work?
    The 1990 census recognized three dimensions:

  • But land use class, e.g. office, commercial, institutional, etc. was a missing dimension.

  • 2. How has census data on kind of work supported transportation planning?

    3. What were the shortcomings of 1990 census data on workers and kind of work?

    Problems in locating jobs:

    The mixed land use nature of the Standard Industrial Classification (SIC) system used by the 1990 census: 4. What is different concerning kind of work in Census 2000?

    The biggest change is the North American Industry Classification System (NAICS). Facts about NAICS:

    Census 2000 must use 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.

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    Publications Showcasing
    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, [1997]
    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, [1985]
    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, [1994] 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, [1984]
    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, [1994] 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, [1997]
    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, [1995] Transportation Research Board / National Research. Advances in Transportation Data: 1997, Publication No. 1593. Washington, DC: National Academy Press, [1997]
    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, [1997] 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]
    For information on obtaining copies of any of the above publications
    call Tom Mank at 202-366-4087 or e-mail him at Tom.Mank@fhwa.dot.gov
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    TRB Subcommittee--Message from the Chair
    This past July, the TRB Subcommittee on Census Data for Transportation Planning met in Seattle as part of the joint summer meetings of the TRB Planning, Data, Economic, Finance, Management, International, Statistics, Urban Goods and Women Issues Committees. Our meeting was well attended and a copy of the agenda can be found at:
    http://www.TRBcensus.com/notes/mtg0798.html.

    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:
    http://www.TRBcensus.com/minutes/0198trb.html.

    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:
    http://www.TRBcensus.com/.

    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 majordomo@chrispy.com with the words "subscribe ctpp­news" in the body of the message.

    Ed Christopher
    Chair, Subcommittee on Census Data for Transportation Planning

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    Software for Delineating Traffic Analysis Zones (TAZ)
    Bob Grundstad and Clay Grant, Election Data Services, Inc.
    The following are specifications for a program designed to enable local MPOs and State DOTs to submit the boundaries of their Traffic Analysis Zones (TAZs) to the Census Geography Division for addition to their TIGER database. We are calling this software "TAZ-UP".

    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.

    Key Features
    GENERAL GENERAL FUNCTIONS SPECIALIZED FUNCTIONS  [NOTE: This is not a complete list of specialized software functions. Details of other specialized functions will be communicated at a later date.] DATABASE TECHNICAL SUPPORT
    Requirements for Using TAZ-UP Software
    Listed below are the general system requirements that participating agencies will need to meet to provide "digital" TAZ updates for CTPP 2000. If an agency does not meet the computer requirements listed below, "paper" maps will be available for "redlining" TAZs, similiar to the method used for the 1990 TAZ program.
    Preferred System Requirements
    • Personal Computer
    • Pentium 200 MHz
    • 64 MB RAM
    • 4 GB hard disk drive
    • Windows 95 or Windows NT
    • 21" (or larger) VGA color display monitor and 4 MB video memory for screen resolution of at least 1024 x 768 pixels
    • Laser printer
    • HP DeskJet 680C (color) printer
    • Backup tape unit
    • Modem
    • Uninterrupted Power Supply (UPS)
    Minimum System Requirements
    • Personal Computer
    • 486-DX2/66
    • 16 MB RAM or greater
    • Enough free space on hard drive to hold TIGER/LINE98 files for your area
    • CD-ROM drive
    • Windows 95, Windows 98, or Windows NT
    • 15" (or larger) VGA color display monitor
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    Tidbits
    TRB Session Planned
    The TRB Subcommittee on Census Data for  Transportation Planning will host a session on Monday, January 11, 1999 at 3:45 p.m.  Following the Seesion the subcommittee will meet.  Look for session 133 in the TRB Program.
    Just Clcik Here.
    Statistical Area Program
    Coordination
    The Census Bureau suggests that MPOs / DOTs begin consulting with their local Statistical Areas Program regarding potential changes to census boundaries. Your involvement will help ensure local level consistency between TAZs and census boundaries.
    Trends in Single Occupant Vehicles
    TCRP "Research Results Digest" summizing TCRP H-13B--Trends in Single Occupant Vehicle and Vehicle Miles of Travel Growth in the United States is now available.  The report, conducted by Charles River Associates used 1990 Census JTW, and supplemental data from NYC.  It discusses suburbanization, HOV facilities, parking prices and is available from TCRP at http://www2.nas/edu/trbcrp
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    "Surf's Up"   Web Sites  to Remember


    CTPP Contacts
    TRB Committees
    Ed Christopher (Census Subcommittee Chair) 
    PH: 312-793-3467 
    FAX: 312-793-3481 
    EdC@TRBcensus.com 
    Chuck Purvis (Urban Data Committee Chair)
    PH: 510-464-7731
    FAX: 510-464-7848
    cpurvis@mtc.ca.gov
    Ed Limoges (Census Subcommittee Secretary)
    PH: 313-961-4266 
    FAX: 313-961-4869 
    limoges@semcog.org
    Ron Tweedie (State Data Committee Chair) 
    PH: 518-457-1695 
    FAX: 518-457-8317 
    rtweedie@gw.dot.state.ny.us

    Census Population Division (JTW questions)

    Phil Salopek 
    PH: 301-457-2454 
    FAX: 301-457-2481 
    phillip.a.salopek@ccmail.census.gov
    Celia Boertlein
    PH: 301-457-2454
    FAX: 301-457-2481
    celia.g.boertlein@ccmail.census.gov

    Census Geography Division (for TAZ update questions)
    Todd Blair 
    PH: 301-457-1099 
    FAX: 301-457-4710 
    toddblair@quickmail.geo.census.gov 
    Bob LaMacchia
    PH: 301-457-1022
    FAX: 301-457-4710
    rlamac@census.gov

    FHWA
    Tom Mank (2000 CTPP Status questions) 
    PH: 202-366-4087 
    FAX: 202-366-7660 
    Tom.Mank@fhwa.dot.gov
    Elaine Murakami 
    PH: 202-366-6971 
    FAX: 202-366-7742 
    Elaine.Murakami@fhwa.dot.gov
    Jerry Everett 
    PH: 202-366-4079 
    FAX: 202-366-3713 
    Jerry.Everett@fhwa.dot.gov 

    BTS
    Wende O'Neill 
    PH: 202-366-8876 
    FAX: 202-366-3640 
    E-mail: wende.oneill@bts.gov 

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    Census Bureau Regional Office Contacts
    For up-to-date Regional Census Center information go to
    http://www.census.gov/field/www/

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