The Virginia Tech Transportation Institute’s landmark 100-Car Naturalistic Driving Study transformed researchers’ understanding of what actually causes crashes by observing drivers in real-world conditions instead of controlled testing environments. Conducted over a year, the study equipped participants’ personal vehicles with cameras and sensors while allowing them to drive normally, resulting in more than 42,000 hours of driving data covering approximately 2 million miles. Unlike traditional crash investigations that rely on post-crash evidence or brief event data recorder snapshots, the study captured driver behavior before crashes and near crashes occurred, providing an unprecedented view of everyday driving risks.

Among its most significant findings was that driver inattention played a far greater role in crashes than previously believed. Researchers found that distraction or inattention contributed to about 80 percent of crashes, 93 percent of rear-end collisions, and 65 percent of near-crash events, far exceeding earlier estimates based on police reports. The study also highlighted the dangers of fatigue, smartphone use, and other distractions that are often underreported in crash statistics. Its success laid the foundation for larger naturalistic driving research efforts, including the Second Strategic Highway Research Program (SHRP2), and continues to influence traffic safety research and the evaluation of advanced driver assistance systems today.

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