The debate over speed limits is a tug-of-war between the desire for efficiency and the laws of physics. For every 10 mph increase in speed, the risk of a fatality in a crash doubles. Speed limits aren't arbitrary "revenue generators" for police; they are calculated based on a road’s design, sightlines, and proximity to pedestrians.
However, the "85th percentile rule"—setting limits based on how fast people naturally drive—is being challenged by vision-zero advocates. They argue that design should dictate speed. If a road feels like a highway, people will drive like it's a highway. By narrowing lanes and adding trees or "traffic calming" measures, we can naturally slow drivers down without relying solely on signage and enforcement.
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