National Highway Traffic Safety Administration
http://www.nhtsa.dot.gov/
Notes:
Next, let’s look at the NHTSA web site listed above. NHTSA maintains two surveillance systems for motor vehicle related events in the United States. The first is the Fatal Analysis Reporting System (FARS) which generates information on all motor vehicle accidents involving fatalities in the United States. Look through the FARS page to identify the methods which are used to monitor these injuries. Actual data from the FARS system will be available online soon.
The second is the General Estimates System (GES) which generates data on a random sample of motor vehicle accidents in the United States. Take a look at the GES page to identify the methods behind this surveillance system. The actual GES data were online at one point in the past on the Gopher system, so that it was possible to download the dataset and examine it to answer specific questions that you had.