Census Transportation Planning Products (CTPP)

Program OverviewMarch 11, 2010

Overview of the CTPP Program

• CTPP is an AASHTO sponsored data program funded by member state transportation agencies

• CTPP operates with support from FHWA, RITA, FTA, Census Bureau, MPOs and TRB

• The CTPP program includes: – Data products– Training and technical assistance– Research

• Designed for the transportation community

Applications of CTPP

• Performance measurement

• Modal share analysis• Environmental justice• FTA New Starts/Small

Starts• Travel Demand

Modeling

• Livability analysis• Corridor planning• Air quality modeling• Trend analysis• Descriptive statistics• Travel forecasting

CTPP Data Sources

• CTPP uses data from the US Census Bureau American Community Survey (ACS).

• The ACS replaced the decennial census “long form” and requires accumulation of data over multiple years for small area tabulation– 1 Year of data for places with 60,000+ people

– 3 Years of data for places with 20,000 + people

– 5 Years of data for smaller geographic areas, e.g. TAZs

Key CTPP Variables• Data on Households

– Size, income, vehicles per household• Data on Workers

– Age and gender, occupations, earnings• Data on Journey to Work

– Usual mode to work, commuting time, work departure time

• Data on Workplaces– Work locations, times of arrival at work

Key CTPP Products

• Transportation Profiles for state, county and place

• CTPP 3-Year Data Products– Data access and visualization tools

• CTPP 5-year Data Products– TAZ development– Data access and visualization tools

• National Data Products

Additional CTPP Products

• Training and technical support– On-call user support– Training classes and web seminars

• Research– Integration of data sources– Disclosure avoidance

• Sharing of best practices, successes, challenges and constraints

CTPP Program Activities and Costs

Develop specialized data products 63%Conduct research, training and outreach 21%Manage the program 3%Unallocated balance 12%

Total Program Costs $5,844,332

5-Year Program: 2007-2012

CTPP Oversight Board17 Voting Members – 9 States, 8 MPOs

10 Ex-Officio Members

• Jennifer Finch – Chair, CO• Jonette Kreideweis, Vice

Chair, MN• Laine Heltebridle, PA • Nathan Erlbaum, NY• Hui Wei Shen, FL• Paul Agnello, VA • Phillip Mescher, IA• Ahmad Jaber, UT• Ayalew Adamu, CA

• Kuo-Ann Chiao, NYMTC• Steven Gayle, BMTS• Mell Henderson, MARC• Arash Mirzaei, NCTCOG• Guy Rousseau, ARC• Clara Reschovsky,MWCOG• Pete Swensson, TRPC• Vacancy• Penelope Weinberger,

AASHTO, CTPP Program Manager

CTPP Oversight BoardEx-Officio Members

• Ed Christopher, FHWA• Melissa Chiu, Census

Bureau• Alison Fields, Census

Bureau• Rich Denbow, AMPO• Elaine Murakami, FHWA

• Robert Padgette, APTA• Alan Pisarski, Consultant• Steven Polzin, USF. CUTR • Nanda Srinivasan, TRB• Elaine Murakami, FHWA• John Sprowls, FTA

AASHTO Census Data Work Group With 30+ MembersCTPP Federal Technical Advisory Group

TRB Subcommittees– List Serve (830 Members) & Quarterly Newsletters

CTPP Accomplisments To Date

• State, Local and County Profiles for 2005-2007 are completed and posted at the AASHTO website– http://ctpp.transportation.org/profiles_2005-2007/ctpp_profiles.html

• 3-Year CTPP list has been finalized and approved by the Census Bureau

• Data access software development contract is in place

• Plans for a TRB Census Conference in 2011 are underway

CTPP Key Contacts

• Penelope WeinbergerAASHTO CTPP Program Manager202-624-3556pweinberger@aashto.org

• Melissa ChiuCTPP Program CoordinatorCensus Bureau301-763-2421Extension 2454melissa.c.chiu@census.gov

http://ctpp.transportation.org

An Early CTPP Data Product

Ed Christopher Resource Center Planning TeamFederal Highway Administration

4749 Lincoln Mall Dr. Rm 600Matteson, IL 60443

708-283-3534edc@EdtheFed.com

ACS Data Profiles

Why do them? What good are they?

Foundation Building

Snapshot of Area

Quickly compare Between Areas

Begin to Understand Changes

Good introduction to the data

Easy to do!

What are they?

2000 Profiles (1990 and 2000 data)

2005 Profiles (1990, 2000 and 2005 ACS)

2005, 2006 and 2007 (2000 and 3-year ACS)

Data Summaries Focus on Transportation

Variables Resident and Workplace data Includes Significance Tests And MOEs for 2000 Data Various Geographies

WorkplaceResidence

2000 Long Form DataStates and all counties

2005 ACS (65K+ people)

States, Large Cities, MSAs and CSAs2005, 2006, 2007 ACS (20K+ people)

States, Counties and Places

Includes

What do the Profiles Include?

Note:

3-year ACS data is only available for areas with 20,000 or more residents

Where do you find the Profiles?

http://ctpp.transportation.org

Finding CTPP Profiles

http://download.ctpp.transportation.org/profiles_2005-2007/ctpp_profiles.html

3-Year Data Profiles

Read the Notes and Cautions

Let’s get the data

Selecting a Profile

Make Your Selections

and Click Submit

Where is Part 2 Profile 2?

Just Choose Your Profile and Click on It

What you get (Part 1, Profile 1)

What is going on here?

What you get (Part 1, Profile 1)

Mode To WorkMode to Work CollapsedTravel time to WorkDeparture time for WorkMean Travel time to Work

Vehicles available in HHMode to Work by Poverty statusMode to Work by Vehicles availableHH size by Vehicles available

3-Year Data Profiles

Wrapping up

Need to Brush up on significance testinghttp://www.edthefed.com/presentations/significance%20testing.ppt

Check out the Profiles for your area http://ctpp.transportation.org

Census Transportation Planning Products (CTPP)

Mar 11, 2010CTPP Snapshot Webinar

Journey to Work and Migration Statistics BranchHousing and Household Economic Statistics Division

U.S. Census Bureau

CTPP and ACS Schedule

June 2010 CTPP 2006-2008 released in text (.CSV) format

Sept 2010 CTPP 2006-2008 data access software completed

Dec 2010 ACS 2005-2009 standard products released

(tracts, block groups)

Spring 2011 TAZ 2010 Delineation

Summer 2012 CTPP 2006-2010 (tentative)

CTPP 2006-2008 Table Summary

NUMBER of Tables (excluding collapsed versions)

All 204

Part 1 Residence Tables 123

Part 2 Workplace Tables 56

Part 3 Commuting Flow Tables 25

Collapsed Versions of VariablesA “collapsed” version of a variable combines

categories on that variable Use of collapses is advantageous because … Due to disclosure protections, there is a

minimum of 3 unweighted records per cell for calculations of – Averages (e.g. mean travel time) – Aggregates (e.g. number of vehicles used)

Standard errors calculated by Census Bureau– ACS replicate weight SEs difficult to calculate– Standard errors are more accurate than when

combining categories and recalculating from published numbers

Means of Transportation (MOT) Collapses

An AASHTO task force defined MOT collapses for the CTPP

Collapses are designed to – Adapt to disclosure protection needs – Accommodate a variety of planning needs

in different types of geographic areas– Versions do not all fully nest – MOT (7) provides more detail on non-private

vehicle modes– MOT (6) provides more detail on carpools

Means of Transportation (MOT)- Full Version MOT (18)

1 Total

2 Drove alone 13 Bicycle

3 Carpooled, 2-people 14 Walked

4 Carpooled, 3 people 15 Taxicab

5 Carpooled, 4 people 16 Motorcycle

6 Carpooled- 5- or 6- people 17 Other method

7 Carpooled- 7 or more people 18 Worked at home

8 Bus, trolley bus

9 Streetcar, trolley car, light rail

10 Subway, elevated

11 Railroad

12 Ferryboat

Means of Transportation (MOT)- Collapsed Versions

MOT (11) MOT (7)1 Total 1 Total

2 Drove alone 2 Drove alone

3 Carpooled, 2-person3 Carpooled4 Carpooled, 3 or more people

5 Bus, trolley bus

4 Public transportation 6 Streetcar, light rail, subway

7 Railroad, ferryboat

8 Bicycle5 Bicycle or walked 9 Walked

10 Taxi, motorcycle, other method

6 Taxi, motorcycle, other method

11 Worked at home 7 Worked at home

Means of Transportation (MOT)- Collapsed Versions

MOT (6) MOT (4)1 Total 1 Total

2 Drove alone 2 Drove alone

3 Carpooled, 2-person3 Carpooled4 Carpooled, 3 or more people

5 Public transportation, bicycle,

walked, taxi, motorcycle, other

method

4 Public transportation, bicycle,

walked, taxi, motorcycle, other

method, and worked at home

6 Worked at home

Content- Means of Transportation

MOT (18) is used in univariate tablesOnly 5 characteristics are allowed to cross with

MOT, due to disclosure protectionsAn AASHTO tables task force selected:

– Travel time – Departure time from home /

arrival time at workplace– Vehicles available in household – Age– Household income

All 4 collapsed MOT versions are crossed by these 5 variables in all 3 Parts of the CTPP

Content- Journey-to-Work

Besides means of transportation, other commuting tables are included: – Travel time (minutes) – Departure time from home /

arrival time at workplace– Vehicles available in household – Number of vehicles and carpools used – Workers per carpool, vehicle ridership

For details, go to:www.fhwa.dot.gov/ctpp/acsdataprod.htm

Content- Other Information

Characteristic Examples

Socioeconomic Industry, occupation, poverty status, earnings, class of worker, usual hours worked per week, employment status

Social and demographic

Age, minority status/race/hispanic origin, length of U.S. residence, language spoken at home, school enrollment

Household Household size, number of workers, age of youngest child, number of people over 16, number of people under 18, linguistic isolation, lifecycle (family type)

Housing Tenure, units in structure, telephone availability, vacancy status

Urban/ rural residence - (Part 1 only)

CTPP 3-year Geography (only areas population size 20,000+)

Pt. 1 Residence Geography Pt. 2 Workplace Geography

Nation (US Total) * Nation (US Total) *

State * POW State *

State-County POW State-County

State-County-MCD (12 states only) POW State-County-MCD (12 states)

State-Place POW State-Place

State-PUMA5 POW State- POWPUMA

Metropolitan Statistical Area POW Metropolitan Statistical Area

MSA- Each Principal City POW MSA- Each Principal City

Worked in Canada

Worked in Mexico

Worked outside US/Canada/Mexico

* Nation and state also tabulated at geographic components.

CTPP 3-year Geographic Components* (only areas population size 20,000+)

Pt. 1 Residence Geography Pt. 2 Workplace Geography

Not a geographic component (Total) Not a geographic component (Total)

In a metro or micro area (CBSA) In a metro or micro area (CBSA)

Not in a metro or micro area Not in a metro or micro area

In a metro area In a metro area

In a metro area- principal city In a metro area- principal city

In a metro area- not in principal city In a metro area- not in principal city

Not in a metro area Not in a metro area

In a micro area In a micro area

In a micro area- principal city In a micro area- principal city

In a micro area- not in principal city In a micro area- not in principal city

Urban -

Rural -

* Geographic components only tabulated for nation and state.

CTPP 3-year Flow Geography (only areas population size 20,000+)

Part 3 Commuting Flows

From Home: To Work:State POW State

State-County POW State-County

State-County POW State-Place

State-County-MCD (12 states only) POW State-Place

State-County-MCD (12 states only) POW State-County-MCD (12 states only)

State-Place POW State-Place

State-PUMA5 POW State- POWPUMA

State-PUMA5 POW State-Place

MSA- Each Principal City POW MSA- Each Principal City

CTPP ResourcesFederal Highway Administration (FHWA)

www.fhwa.dot.gov/ctpp/Upcoming CTPP data products2000, 1990 CTPP data products

AASHTOctpp.transportation.org/Transportation profiles, training materials

Transportation Research Boardtrbcensus.com

Bureau of Transportation Statistics (BTS) www.transtats.bts.govCTPP 2000, CTPP 1990 data download

Information about the American Community Survey

www.census.gov/acs/Subscribe to the

ACS Alert

Web Site Improvements Training

New and revised content on ACS web siteACS Compass Series: Understanding the

the ACS (UTACS) Handbooks

Tutorials and Powerpoint slideswww.census.gov/acs/www/UseData/Compass/compass_series.html

Train the Trainer workshops at SDCs, regional offices, etc.

Data User Education: Target Audiences for ACS Compass and Other Materials

General Users

Businesses

High School Teachers

Media

Congressional Staff

State & Local Governments

Federal Agencies

Researchers

Rural Areas

PUMS Users

American Indians / Alaska Natives

PRCS (in Spanish)

U. S. Census Bureau

Melissa Chiu, CTPP Coordinator Journey-to-Work & Migration Statistics BranchHousing and Household Economic Statistics

Division301-763-2421melissa.c.chiu@census.gov

www.census.gov/population/www/socdemo/journey.html

Getting Your CTPP 3-year data

On line (Web Based)

Table Extractor

Similar to CTPP 2000

Easy to Use

Downloadable ~ stand alone use

Mapping component

“Free” with registration

Additional Software Highlights

User saved sessions

Graphic and charting features

Variable grouping

MOE recalculation

Exportable data (xls, cvs, txt, dbf)

Training Tutorials

Much, much more

Presented to:

Presented by:

Transportation leadership you can trust.

CTPP 5-year Tabulation

TAZ Delineation

CTPP Community

Liang Long

March 11, 2010

51

The Schedule of TAZ Delineation Tasks

Task1: TAZ Business Rule Memo

TAZ Business Rules Technical Subcommittee established (Summer 2009)

Draft memo posted (December 2009)

Feedback (December 2009 – March 2010)

Final deliverable submitted to the Census Bureau (March 2010)

52

Task1: TAZ Business Rule Memo

Two levels of custom tabulation geographyI. Traffic Analysis Zone (TAZ): RECOMMEND 1,200

population

II: Transportation Analysis Districts (TAD): RECOMMEND 20,000 population

III: 1,200 and 20,000 are recommendations, NOT thresholds

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Task2: Organizing Geographic Responsibilities for TAZ

State DOT contact verified for TAZ delineation task (October 2009);

Agency responsibility spreadsheet due January 8, 2010;

Final review for the list (Fall, 2010)

Deliver the list to the Census Bureau for software distribution.

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NCHRP 08-79Producing Transportation Data

Products from the ACS that comply with Disclosure Rules

• Project schedule: Jan 2010-July 2011– Fast-track with final report due in July 2011– Need results to be applied to 2006-2010 ACS for

the 5-year CTPP (delivery in summer 2012)

• Westat, Tom Krenzke, PI• Budget: $550,000

Tasks already completed!

• NCHRP panel (Guy Rousseau of ARC is the chair) met to review the workplan with the contractor on January 26, 2010

• Westat met with CB DRB on February 1, 2010.– Westat has 2 programmers with “sworn status” who

will work on-site at Census Bureau’s office in Suitland Maryland

• VHB (Rich Roisman, Frank Spielberg) will be conduit for testing “real” compared to “synthetic” ACS tabulations for travel demand applications

Methods to Test

• Deterministic- limit size of TAZs, and limit variable classes

• Random error applied to – Pre-generated tables, or– Microdata (individually, or in combination)

• Small area estimation• Unit-level model• Imputation• Data swapping• Super-sampling• Additive noise

What is a credible method?

• Must be implementable at the CB– Must pass the DRB approval– SAS code which can be modified by CB ACSO staff– Computer processing time

• Interative processes must converge quickly• Bayesian approaches must not “run forever”

• Results must make sense to transportation analysts– Preserve the descriptive qualities (univariate tables

should be near match to “real” ACS)– Should not result in erroneous diagnosis for validating

home-based work trips in travel demand forecasting models.

CTPP Resources

• Please join the CTPP listserv (use “digest” to limit the emails)– http://www.trbcensus.com/maillist.html

• Websites: – AASHTO: http://www.transportation.org/ctpp– USDOT:

http://www.fhwa.dot.gov/planning/census/index.htm – TRB Census subcommittee

http://www.trbcensus.com/

Read the CTPP Status Reporthttp://www.fhwa.dot.gov/ctpp/status.htm

Key People for Technical Support and Training

• Penelope Weinberger, AASHTO– pweinberger@aashto.org

• Liang Long, Cambridge Systematics– liang.long@dot.gov

• Melissa Chiu, US Census Bureau– melissa.c.chiu@census.gov

• Ed Christopher, FHWA– edc@berwyned.com

• Elaine Murakami, FHWA– elaine.murakami@dot.gov