3. Adaptive cruise control
auto assists adaptive cruise control

It's real helpful in traffic when you have it; real dangerous if you think it is there -- and it isn't. Partial versions slow you down while others bring you to a complete stop. Though Lexus brought the first system to the U.S. in 2000, many domestic models didn't begin offering it until a decade later.


  @FortuneMagazine - Last updated May 13 2013 02:04 PM ET
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