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DATA R US Personal Travel Data, including CTPP and NPTS Portland State University April 29, 2005. Elaine Murakami, FHWA Ed Christopher, FHWA What are Personal Travel Data?. What are Personal Travel Data?. l Daily activities and travel

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data r us personal travel data including ctpp and npts portland state university april 29 2005

DATA R USPersonal Travel Data, including CTPP and NPTSPortland State UniversityApril 29, 2005

Elaine Murakami, FHWA

Ed Christopher, FHWA

what are personal travel data1

What are Personal Travel Data?

l Daily activities and travel

l How we get to work

l When do we use the bus or rail or air

l What are motivations for traveling

l What are cost trade-offs (value pricing)


There were significantly more households in 2001 than in 1995 who owned a greater number of vehicles than there were drivers in the household



14.5 million

15 million

64.5 million

63 million

20 million

14 million

2.8 million

1.4 million


The average amount of time we spent in a vehicle in 2001 was slightly more than an hour. Children younger than 5 years old spent an average of ¾ of an hour a day in vehicles

average daily occupancy by urbanized areas population and trip purpose
Average Daily Occupancy by Urbanized Areas population and Trip Purpose

Source: NCHRP 365, using 1990 NPTS

personal travel main data types
Personal Travel: Main data types

l Residence-based: households, persons, vehicles, person trips

lWorkplace-based: employment/jobs, workers, work trips

l Other: Transit surveys: on-board, rider/non-rider

l Special attractors: airports, schools/universities, major shopping centers, etc.

potential types of questions
Potential types of Questions

l Revealed preference – current behavior

lStated preference – how might act in future under certain conditions

lMotivations for travel, and scheduling changes

residence based

l Household Travel Surveys

-- National

-- Regional/local

l Decennial Census and American Community Survey

workplace based
  • lPublic Sources

ES-202 files

lCommercial Files

Dunn & Bradstreet


l CTPP Parts 2 and 3

l LED program (test)

today focus on 2 main surveys
Today, focus on 2 main surveys


-- Historical Trends

-- Small area data

-- Residence, Workplace AND Flow


-- Historical Trends

-- Limited to Large geography only -- Includes all trip purposes, trip chaining file available

--NCHRP 365

--Data transferability project


What is the CTPP?

The Census Transportation Planning Package is a set of special tabulations from the long form of the decennial census designed by transportation planners for transportation planners

It summarizes the data

Flows between Home and Work

At Workplace

At Residence

decennial census long form
Decennial Census Long Form

Sample is 1:6 addresses nationwide, allowing for reporting at very small geography

Transportation Related Questions-- Place of Work

-- Means of Transportation to Work

-- Carpool Occupancy to Work

-- Departure Time for Work

-- Travel Time to Work

-- Vehicles Available


What are the CTPP Products?

Main CTPP Products

Tabulations at Residence

Tabulations at Workplace

Flows between Home and Work

Part 1Part 2Part 3

Collateral Products

  • State and County Profiles
  • County Flow Data

How are they packaged?

CTPP Access Tool



ctpp access tool
CTPP Access Tool

l Easy to Use Software Interface

-- Easy to manipulate rows and columns, including calculating new variables

l .ivt files (proprietary format)

l Shape files included for many Census geographic units

l Exports to .shp, .dbf, .xls, ASCII

l Mapping and charting components imbedded


What is in the CTPP?

Let’s Look at the Details

So how does this thing work?


Tables—Lots of Tables

121 Tables of Residents’ Based Data

68 Tables of Work Place Data

14 Tables of Flow Data


Variables--Lots of Variables

  • Person
    • Worker Status
    • Age, Sex, Race, Hispanic Origin, Disability


  • Household
    • Income
    • Nos. Vehicles Available
    • Size and Nos. Workers
  • Journey-to-Work
    • Work Location and Mode
    • Departure and Travel Time
    • Arrival Time (Calculated)
data issues
Data Issues

l Rounding

l Thresholds

l Workers at Work vs. Jobs or Employment


No record threshold

Must have 3 unweighted records


Workers at Work Counts vs. Other Employment Sources

Total jobs are HIGHER than CTPP worker counts

CTPP uses NAICS, others may use SIC

Multi-site businesses and job types not reported consistently

Census 2000 employment estimates vs CPS

Extended Allocation for CTPP small areas

with all this said and done now what can i do
With all this said and done now what can I do?

l Build profiles (Part 1 example)

lTrend Analysis

lSurvey Weighting

l Planning Process

-- Environmental Justice, Title VI

-- TDM programs

-- Transit service planning

-- Model calibration and validation

other census data
Other Census Data

100% data or SHORT-FORM information

  • Redistricting Summary File (PL Data)
  • Summary File 1 (SF1)
  • Summary File 2

Sample data or LONG-FORM information

  • Summary File 3 (SF3)
  • Summary File 4

Public Use Microdata Sample Files (PUMS)

nhts basics
NHTS Basics

l 28,000 households in U.S. plus nearly 44,000 households in add-on Program.

l Telephone recruit, mail-out diary, telephone retrieval.

l Cash incentives (recruit and diary)

l 41 percent overall response rate.

l March 2001 thru May 2002

nhts basics continued
NHTS Basics, continued
  • Destination locations are only geocoded for add-on records. Otherwise, self-report for distance
  • Sample size is small, relative to total U.S. population, so geographic detail is very limited, e.g. MSA size, some states.
what travel is included
What travel is included?
  • Assigned travel for 1 day, includes all 365 days of the year. Good resource for WEEKEND data, as 30 percent of sample is for weekends!
  • Long distance trips from 4-week period.
  • All modes of travel
nhts file structure
NHTS File structure


Land Use



Person 1

Person 2

Person 3

Veh 1

Veh 2

Trip 1

Trip 2

Vehicle Oper-

ating Char.


Trip 3

Trip 1

Trip 4

Trip 2


2001 NHTS Data Elements

  • Household demographics (race, age, sex, household income)
  • Vehicle information (age, annual miles, fuel type and use, etc.)
  • Commute information (mode, occupancy, time of departure, work location and occupation, distance to work)
  • Time of day and purpose for non-work Travel (mode, occupancy, time, miles traveled)
  • Who’s traveling together from same household

2001 NHTS

Transferability Project

  • Test with 1995 NPTS data CITE for transferability paper! ADD!!!!
  • Assist areas without recent hhld survey data
  • Trip Generation Rates and VMT accounting for census-tract-level characteristics
  • Trips by Purpose, maybe be mode, and time of day

2001 NHTS

Transferability Project

  • Use 2001 NHTS households (we have both detailed travel, and census tract characteristics)
  • Develop clustering system, and cluster all 61,000+ census tracts, except Manhattan and tracts without population.
  • Clustering system for 1995 had 11 clusters.
  • Compare the results of the “synthetic” hhlds to the “real” households from the NHTS add-ons. If this works, then….

2001 NHTS

Transferability Project

  • User defines their “study area” by selecting census tracts.
  • Software returns Trip Generation Rates and VMT by census tract, and study area totals.
2001 nhts on line table generator
2001 NHTS On-line Table Generator
  • Registration required, however, registration is “immediate.”
  • Generates SAS program without your knowing much SAS.
  • Includes the proper weights! Very important.
  • Easy way to examine patterns, can help identify relevant variables for regression or other statistical test.

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