The Stanley wrecked because it hit a bump in the sand that wouldn't have mattered at 100mph, but certainly did at 150mph. The faster you go, the more sensitive your car is to bumps on the road. A bump that is practically unnoticable at 50mph produces a strong jolt if you hit it at 100mph, and could bounce a lightweight car airborne if hit at 150mph. In 1906, people had never traveled at such a high speed and so weren't aware of how the physics changes as the speed rises.
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