Watch Modern Marvels online: Episode 32 Car Crashes

In the mid-1960s, the US lost an average of 55,000 people yearly to car crashes. Since then, the number of cars on the road has doubled, but fatalities have decreased by nearly a third. The dramatic reduction is the culmination of research and development that led to safer roads and cars and quicker emergency response. But car-crash technology's future involves removal of its biggest threat--human drivers! Find out if computers and radar can prevent everything from fender-benders to pile-ups.

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