The denominator for safety exposure calculations (e.g., fatalities
per million ___)
Drivers age/gender correlation to crash rates
Vehicle fleet fuel efficiency
Miles of travel per vehicle
How the Data is Used
Input to other agencies:
National Highway Traffic Safety Administration
National Transportation Safety
Energy Information Agency
Environment Protection Agency
Bureau of Labor Statistics
Federal Bureau of Investigations
Bureau of Transportation Statistics
Government Accountability Office
Motor Vehicle Registrations (Forms FHWA-561, 566 and 571)
State provided data
Number of vehicles registered for highway use:
By vehicle type:
Revenue generated from registration fees
Standard measure of vehicles licensed for use on the highways
States report annually
Adjusted for specific State limitations
Refined into more detailed categories
Readied for publication
Series of Tables in Highway Statistics
Provided to other agencies for further
Definitions – One of the major obstacles in compiling accurate
vehicle registration data is inconsistent vehicle registration. Different
States have different parameters in the definitions which lead to irregularities
among categories. For example, some States register light trucks by weight
rather than by type.
Re-registrations – Vehicle re-registration in different
States as a change in ownership are hard to tract. A problem compounded
by varying registration cycles among States.
Multi-Year Registrations – Registration
cycles are different. Example: 1 year cycle vs. a 4 year cycle.
Buses – Most commercial businesses will register buses in the State
the company is headquartered but the buses are operated in another State.
Tractors – Estimates are made on a State-by-State basis. TT counts
are based on Vehicle Inventory and Use Survey (VIUS).
Trailers – Most States only report total trailers. Need breakdown
(Commercial, House, and Small).
State, County, and Municipal Vehicles – Only total reported by
Light Trucks – Only total reported by State. Need breakdown (pickups,
vans, sport utility vehicles and other light vehicles)
Incomplete and/or Missing Data – Self-explanatory
Drivers License Data
State provided data
Number of drivers licenses issued by:
Revenue generated from license fees
Standard measure of citizens with driving privileges
INSTRUCTIONS FOR FORM FHWA- 562
Other kinds of permits and or licenses to be included are learner permits,
licenses issued solely for the operation of motorcycles, scooters, or mopeds.
have some form of graduated licensing for teenage drivers.
Thus, to improve
driver licenses data quality the definition of "teenage driver" changed.
than 19 States provided the data for graduated licenses for teenage drivers
Therefore, there well may be approximately over 8 million 14- and
15-year olds not accounted for.
Incomplete Age Groups
23 Years and 24 Years – 1 State
75 years and over – 2 States
80 years and over – 2 States
85 years and over – 1 State
Therefore, FHWA must estimate by redistributing
State's reported data based on the Census population.