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Data collection is an important component of aggressive driving programs. Agencies need to establish a method for gathering statistics on aggressive driving violations, but distinguish between aggressive driving infractions and non-aggressive violations (for example, just because drivers are stopped for speeding does not mean they were driving aggressively). Citations should be marked in some manner to identify the true aggressive driving violations. If possible, conduct a traffic study before implementing an aggressive driving program to find out how severe the problem is in a specific area. Data collection early on establishes a baseline for further studies about the effectiveness of the program.
One idea is to obtain crash statistics for a special enforcement area and compare the incidence of aggressive driving related crashes during the program to the incidence of crashes during the same months in previous years. Exact numbers of acts of aggressive driving for previous years may be difficult to obtain. By looking at the number and types of violations contributing to the crash, and separating out those considered consistent with aggressive driving, approximate numbers can be obtained.