2001 National Household Travel Survey Kentucky Add-on Ben Pierce Presentation By.
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Transcript of 2001 National Household Travel Survey Kentucky Add-on Ben Pierce Presentation By.
2001National Household Travel Survey
Kentucky Add-on
Ben Pierce
Presentation By
Acknowledgements
MORPACE, International
FHWA, Office of Highway Policy
Information
Page 3Kentucky Traffic Model Users Group: Travel Survey Workshop
NHTS
Presentation Outline
What is the NHTS? What is the NHTS Add-on Program? Kentucky’s Involvement Overview of Survey Methodology Review of Collected Data Summary of Participation Selected Results in Kentucky
Page 4Kentucky Traffic Model Users Group: Travel Survey Workshop
NHTS
What is the NHTS?
Travel survey that collects information on travel from a national sample of the civilian, non-institutionalized population of the United States
Conducted roughly every five years since 1969, last conducted in 1995
Traditionally collected travel information for one day of travel; in 2001 also collected information on long-distance travel (prior 28 days)
Data are used to produce national estimates of travel and investigate topics in transportation safety, congestion, mobility of various population groups, the relationship of personal travel to economic productivity, the impact of travel on the human and natural environment, etc.
Page 5Kentucky Traffic Model Users Group: Travel Survey Workshop
NHTS
What is the NHTS Add-on Program?
~26,000 households included in the national sample
National sample designed for national estimates – not enough for reliable state and local estimates
FHWA offered states and local municipalities the opportunity to purchase additional samples specific to their area
In 2001, additional samples were purchased by nine state and local municipalities, adding an additional ~66,000 households
These additional samples are referred to as NHTS Add-ons
Page 6Kentucky Traffic Model Users Group: Travel Survey Workshop
NHTS
Kentucky’s Involvement
Kentucky participated as a 2001 NHTS Add-on Purchasing 1,100 households in Kentucky
CountyNumber ofPurchased
Households
Number ofCompleted
Households
Carter 150 150
Edmonson 150 165
Pulaski 400 423
Scott 400 416
Total 1,100 1,154
Page 7Kentucky Traffic Model Users Group: Travel Survey Workshop
NHTS
Overview of Survey Methods
Computer Assisted Telephone Interview (CATI)
Samples (households) are selected based upon telephone numbers using list-assisted, random digit dialing methods
Two stage survey– Household interview
– Person-level interview (Extended Interview)
Page 8Kentucky Traffic Model Users Group: Travel Survey Workshop
NHTS
Overview of Survey Methods (cont.)
Pre-Contact Letter
Household CATI
Interview
TravelDiaries
Telephone Reminder
Calls
Extended CATI
Interviews
Signed by Terri Giltner,Exec. Dir.Office of Public Affairs, KYTC
$2 incentive
First Class mail
Up to 19 calls
Household characteristics
Household demographics
Respondent 18
Diaries + Memory Aids
$2 per person incentive
Priority Mail
Travel Day is 10-16 days after Household Interview
Day before Travel Day
Message left on answering machine
3 busy signals before no-contact
Within 6 days after Travel Day
Personal travel characteristics
Trip information
Proxy reporting allowed
Page 9Kentucky Traffic Model Users Group: Travel Survey Workshop
NHTS
Overview of Survey Methods (cont.)
Things to Note: NHTS employs a “memory jogger” style
diary, and is a trip-based survey Information on trips is collected by first
“rostering” all trips for an individual, then going back and asking detailed information for each trip
Trips are 1-way; origin-to-destination Proxies are permitted, but only under certain
conditions
Page 10Kentucky Traffic Model Users Group: Travel Survey Workshop
NHTS
Please remember, a trip is whenever you go from one address to another.Have this diary by the phone when the interviewer calls. You do not need to mail it back to us. Thanks!
NATIONAL HOUSEHOLD TRAVEL SURVEY
TRAVEL DIARYAt the beginning of my travel day (4:00 a.m.) I was: Home Some other place
What was the LOCATION? What TIME did youstart and end each trip?
WHEREdid you go?
(Name of place)
ADDRESS INTERSECTIONTYPE OF PLACE OR
BUSINESS Started at: Arrived at:
HOWdid you travel?
How FARwas it?
(blocks or miles)
EXAMPLE:West Park
2900 Main St.Southfield, MI 48031 Main St. & Evergreen Rd. Shopping Mall 2:00 pm 2:55 pm Walk, bus, walk 6 miles
1.
ABC123 Polk St.Chicago, I L 60602
Polk St. & State St. Offi ce Products 7:35 a.m. 8:43 a.m. Car, Subway, Walk 12 miles
2.
New City Diner1220 Wabash St.Chicago, I L 60602
9th St. & Wabash St. Restaurant 12:04 p.m. 12:16 p.m. Walk 2 blocks
3.
ABC123 Polk St.Chicago, I L 60602
Polk St. & State St. Offi ce Products 12:58 p.m. 1:10 p.m. Walk 2 blocks
4.
Fast Gas3437 Stone Park Rd.Melrose Park, I L 60571
Stone Park Rd. & Chicago Ave. Gas Station 5:50 p.m. 6:35 p.m. Walk, Subway, Car 11 miles
5.
Super Deal3560 Stone Park Rd.Melrose Park, I L 60571
Stone Park Rd. & 35th St. Grocery Store 6:42 p.m. 6:48 p.m. Car 1 block
6.
Happy Kids1832 Wolf Rd.Northlake, I L 60575
Wolf Rd. & Franklin Ave. Daycare Center 7:05 p.m. 7:09 p.m. Car 4 blocks
7.
Home279 Fair Oaks Rd.South Plainfield, I L 60521
Fair Oaks Rd. & Ridge Rd. Residence 7:14 p.m. 7:22 p.m. Car 1 mile
8.
9.
10.
Page 11Kentucky Traffic Model Users Group: Travel Survey Workshop
NHTS
Three Methodological Differences from NHTS National Methodology1. National Sample used $5 incentive vs. $2 in
Kentucky Add-on
2. National Sample included questions on long-distance travel, Kentucky Add-on did not
3. Definition of a “completed” household differed:
National Sample = At least 50% of householdmembers aged 18 years or older needed tocomplete the extended (person-level) interview
Kentucky Add-on = All members of thehousehold needed to complete an extended(person-level) interview
Page 12Kentucky Traffic Model Users Group: Travel Survey Workshop
NHTS
Data Collected
FOR EACH HOUSEHOLD:Number of peopleNumber of driversNumber of workersNumber of vehiclesIncomeHousing typeOwned or rentedNumber of cell phonesNumber of other phonesRace of reference personHispanic status of reference personTract & block group characteristic
FOR EACH PERSON:AgeGenderRelation to reference personDriver statusWorker status/Primary activityInternet useTravel disabilityEffect of disability on mobilityHighest grade completedImmigrant statusViews on transportationAnnual miles drivenIncidence of public transit use in past two monthsIncidence of walk and bike trips in past week
Page 13Kentucky Traffic Model Users Group: Travel Survey Workshop
NHTS
Data Collected (cont.)
FOR EACH WORKER:Full or part‑time workMore than one jobOccupationWorkplace locationUsual distance to workUsual travel time to workDrive alone or carpoolWork from homeIf commercial driver, amount of commercial travel
FOR EACH VEHICLE:MakeModelAge (year)
DAILY TRAVEL DATA:Origin & destination address (geocoded to Latitudes and Longitudes)Time trip started and endedDistanceMeans of transportationVehicle typeIf household vehicle, which oneIf transit, wait timeIf transit, access and egress modesDetailed purposeNumber of others on tripSpecific household membersNumber not household membersWho droveMost recent trip, for non‑travelers (date)
Page 14Kentucky Traffic Model Users Group: Travel Survey Workshop
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Data Collected (cont.): Geocoding ResultsGeocoding Level Number of Locations Percentage
Households
Address Level 1,126 97.6%
Closest Intersection 20 1.7%
Zip Code Centroid 5 0.4%
Non-Geocodable 3 0.3%
Work Locations
Address Level 938 82.6%
Closest Intersection 86 7.6%
Zip Code Centroid 76 6.7%
Non-Geocodable 36 3.2%
Trip Destinations
Address Level 7,856 80.4%
Closest Intersection 901 9.2%
Zip Code Centroid 662 6.8%
Non-Geocodable 351 3.6%
Page 15Kentucky Traffic Model Users Group: Travel Survey Workshop
NHTS
Summary of Participation
50% of eligible households provided household-level information. Household response rate ~40%
Detailed travel information collected from ~53% of households that completed the household interview and agreed to provide travel information
~40% of all attempted person-level interviews were completed
The overall, person-level response rate for the study ~18%
– Scott County Telephone Issues– Person-level RR lower in Pulaski and Scott– HH level issues were refusals and no-contacts (Scott)– Person-level issues were no-contact cases
Page 16Kentucky Traffic Model Users Group: Travel Survey Workshop
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Results: Summary of Participating Households
Summary of Participating Households
0.0%
5.0%
10.0%
15.0%
20.0%
25.0%
30.0%
35.0%
40.0%
45.0%
50.0%
1 2 3 4 0 1 2 3+ < $20k $20k -$39k
$40k-$59k
$60k>
Per
cen
t o
f H
ou
seh
old
s
Weighted Unweighted 2000 Census
HH Size No. of HH Veh. HH Income
Page 17Kentucky Traffic Model Users Group: Travel Survey Workshop
NHTS
Note on Survey Weights
The NHTS utilized a complex sampling scheme – i.e. this isn’t a simple random sample!
Survey weights were developed for each type of data (household, person, vehicle, trip-level)– Account for complex survey design– Differences in non-response– Post-stratification
Survey weights should always be used when calculating standard errors or measures of precision (e.g., confidence intervals)
Page 18Kentucky Traffic Model Users Group: Travel Survey Workshop
NHTS
Results: Miles of Travel
Vehicle Miles of Travel
3,435,945 or
1,254,120,088 Annualized
Miles Per Vehicle
32.1 or
11,702 Annually
Person Miles of Travel
5,329,575 or
1,945,294,783 Annualized
Miles Per Person
41.7 or
15,220 Annually
Page 19Kentucky Traffic Model Users Group: Travel Survey Workshop
NHTS
Results: Trips
Trips per Household per Day
5.7 Vehicle Trips/HH
9.1 Person Trips/HH
Total Number of Reported Trips
Person Trips Vehicle Trips
453,554 285,913
165,547,299 Annually 104,358,225 Annually
Trips per Person per Day
2.2 Vehicle Trips/person
3.5 Person Trips/person
Page 20Kentucky Traffic Model Users Group: Travel Survey Workshop
NHTS
Results: Percentage of Trips by Day of the Week
Percentage of Trips by Day of Week
0.0%
2.0%
4.0%
6.0%
8.0%
10.0%
12.0%
14.0%
16.0%
18.0%
Sunday Monday Tuesday Wednesday Thursday Friday Saturday
Per
cen
t o
f T
ota
l Tri
ps
Vehicle Person
HH Size No. of HH Veh.
Page 21Kentucky Traffic Model Users Group: Travel Survey Workshop
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Results: Percentage of Tripsby Trip Purpose
Percentage of Trips by Trip Purpose
0% 5% 10% 15% 20% 25% 30% 35% 40%
Home
Work
School/Religious Activity
Medical/Dental Services
Shopping/Errands
Social/Recreational
Family Personal Business/Obligations
Transport Someone
Meals
Other
Don’t Know
Percent of Total Trips
Page 22Kentucky Traffic Model Users Group: Travel Survey Workshop
NHTS
Results
Many More Results…..