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National Center for Statistics & Analysis 1
Use of Data Collected by the National Center for Statistics
and Analysis
Tuesday, March 28, 2006
Presented by: Joseph S. Carra, Associate Administrator, NCSA
National Center for Statistics & Analysis 2
Examples
1. Nopus and Seatbelt Use2. Electronic Stability Control3. FARS and Geospatial Coding
National Center for Statistics & Analysis 4
A Primary Use of Traffic Safety Data
One way that we use data is to:
• determine a safety countermeasure, and
• after implementation of the countermeasure, assess its effectiveness
National Center for Statistics & Analysis 5
An Example
One of NHTSA’s priorities is to increase safety belt use.
National Center for Statistics & Analysis 6
Using Data to Identify a Countermeasure
Historically, belt use has been lower than average in rural communities, and among pickup occupants:
National Center for Statistics & Analysis 7
Identify Countermeasure, Continued
80%
76%70%
50%
60%
70%
80%
90%
100%
Pickup Trucks Rural Areas Nationwide
2004
Belt
Use
Safety Belt Use in 2004
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Implementing the Countermeasure
In 2005, NHTSA chose to focus its Click It or Ticket belt campaign on these two areas – rural areas and pickup occupants:
National Center for Statistics & Analysis 9
Analyzing Countermeasure Effectiveness
76%70%
79%73%
50%
60%
70%
80%
90%
100%
Pickup Trucks Rural Areas
2004 2005
Belt
Use STATISTICALLY
SIGNIFICANTINCREASE
STATISTICALLYSIGNIFICANT
INCREASE
The countermeasure was a success!
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Analyzing effectiveness of emerging technology and quickly
disseminating results leads to appropriate market response.
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How does ESC function?
Anticipates dangerous situations Automatically intervenes Brakes one wheel Corrects over steer and under steer Prevents skids, spins Reduces situations leading to run-
off-road and rollovers
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Databases: ESC
FARS, 1997-2003 NCSA State Data
Florida, 1997-2002 Illinois, 1997-2002Maryland, 1997-2002Missouri, 1997-2002Utah, 1997-2002
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Data Sample: ESC
Passenger Cars• Mercedes-Benz and BMW models – 61 percent• Luxury GM models – 23 percent• Models from other manufacturers (Acura,
Audi, Lexus, and VW) – 16 percent
SUVs• Mercedes-Benz models (ML320, ML350,
ML430, ML500, G500, G55 AMG) – 22 percent• Toyota models (4Runner, Land Cruiser) – 41
percent• Lexus models (RX300, LX470) – 37 percent
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Analysis Method: ESC
Compute ratios of single vehicle crash involvements (excluding pedestrians, bicycles, animals) to multi-vehicle crash involvements (control group).
Compute percentage reductions in these ratios in vehicles with ESC vs. vehicles of the same make-models without ESC.
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2004 ESC Effectiveness Results
In the US, it is estimated that stability control could save 7,000 lives per year.
Passenger Cars
Sport Utility
Vehicles
Fatal single vehicle crash
reduction30% 63%
All single vehicle crash reduction 35% 67%
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Resulting Actions
2004-2006, research leading to rulemaking In 2005, 20% of new vehicles had ESC as
opposed to 10% in 2004. General Motors has announced that by the year
2010, ESC will be standard equipment on all vehicles made.
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The addition of new data element to an existing data system adds a whole new
dimension to the use of the data systems.
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FARS
Congressional Districts
School Districts
Air Medical Services Fly Zones
Which School Districts have high fatal crash incidents?
What are crash rates for Congressional districts?
Is there a significant relationship between survivorship and distance to EMS centers?
And, a countless number of other traffic safety questions...
Primary users of this system are traffic engineers…It is used to identify roadway, signage, design and or traffic signal problems.
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US Census Dept Spatial Data
http://www.census.gov/geo/www/cob/metadata.html
Alaska Native Regional CorporationsAmerican Indian Areas/Alaska Native Areas/Hawaiian Home
LandsCensus Block GroupsCensus DivisionsCensus RegionsCensus TractsCongressional DistrictsConsolidated CitiesCounty and County Equivalent AreasCounty SubdivisionsIncorporated Places/Census Designated PlacesMetropolitan and Micropolitan Statistical AreasNew England County Metropolitan AreaNew England City and Town AreasOregon Urban Growth AreasPublic Use Microdata AreasSchool Districts – Elementary, Secondary, UnifiedState and State Equivalent AreasState Legislative DistrictsTraffic Analysis ZonesTribal Block Groups/Tribal Census Tracts Urban AreasVoting Districts ZIP Code Tabulation Areas
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FARS GIS Reporting
Year Lat-Long Entered Total Cases Entered % Lat-Long Entered
2001 30,901 37,862 81.6%
2002 35,455 38,491 92.1%
2003 35,710 38,447 92.9%
2004(*) 34,746 38,443 90.1%
2005(*) 29,663 33,423 88.7%
(*) Denotes active date entry.