This undated photo made available by General Motors shows the 2014 Chevrolet Impala 2.5L iVLC. The 2014 Chevrolet Impala was the only non-luxury car to earn the highest safety rating in new tests of high-tech crash prevention systems. It earned the top rating even though the government is investigating one driver’s report that the automatic braking system went off several times without warning, eventually causing an accident. Insurance Institute spokesman Russ Rader said the group is aware of the investigation but had no issues when it was testing the Impala. (AP Photo/GM)
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