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Three Theories About Why U.S. Car Crash Deaths Are Plummeting

The National Safety Council estimates U.S. traffic fatalities fell by 12%—about 5,000 lives—in 2024‑25, the sharpest single‑year decline since 1999, bringing total deaths to 37,810. The drop follows extensive federal safety funding, a rebound in post‑COVID traffic congestion, and varied local enforcement strategies. However, methodological differences between NSC and NHTSA data, and gaps in national traffic‑stop reporting, complicate attribution. Analysts propose three leading theories: Biden‑era infrastructure grants, reduced high‑speed driving amid heavier congestion, and shifts in police traffic enforcement.