How Risky is It? An Assessment of the Relative Risk of Engaging in Potentially Unsafe Driving Behaviors
Purpose of Current Study
• To investigate the relative risk associated with a variety of potentially-risky behaviors
including speeding, distracted driving, aggressive driving, and driving while drowsy.
Methodology
• Researchers analyzed data collected under the previous 100-Car Naturalistic Driving
Study (100-Car Study). In the 100-Car Study, a sample of 109 drivers in the Washington
DC / Northern Virginia region were monitored continuously over a period of 12-13 months
using in-vehicle cameras and “black box” technology.
• During the study, 82 crashes, 761 near-crashes, and 8,295 other driving-related incidents
were captured. Note: for the purpose of this study a crash was defined as any time a
vehicle collided with a fixed object or other vehicle.
• Data from these events as well as from normal “baseline” driving were used to compare
the prevalence of specific driver states (e.g., fatigue) and behaviors (e.g., speeding)
during crashes, near-crashes, and normal driving, to estimate the relative crash risks
associated with specific states and behaviors.

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