This undated photo provided by the Insurance Institute for Highway Safety, shows a front-end, crash test of the 2011 Chevrolet Volt. The Chevrolet Volt and Nissan Leaf got top safety ratings in some ... more 
This undated photo provided by the Insurance Institute for Highway Safety, shows a front-end, crash test of the 2011 Chevrolet Volt. The Chevrolet Volt and Nissan Leaf got top safety ratings in some of the first-ever tests of plug-in cars by the Insurance Institute for Highway Safety. less 
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Associated Press | Photo By Insurance Institute for Highway Safety
Tue, Apr 26, 2011 12:11 AM EDT