What the Data on Fatal Car Accidents Generally Shows
Last reviewed: 2026 · Driviology Road Safety Education Team
Quick Answer
Research generally associates fatal collisions with a combination of factors such as excessive speed, impairment, and lack of seatbelt use, rather than any single cause acting alone.
Discussing fatal collisions responsibly means focusing on general patterns rather than specific incidents, and being careful not to overstate any single cause.
Common Contributing Factors
Excessive speed, impairment, and not wearing a seatbelt are among the factors most consistently associated with fatal outcomes in collision research.
These Factors Tend to Overlap
Rather than acting alone, these factors often overlap in a single incident, which is part of why addressing any one of them individually still meaningfully reduces overall risk, as covered further in our guide to impaired driving.
Why This Matters for Everyday Driving
None of these factors are exotic or unusual - they are all within an individual driver's control on every single trip.