Concerns over the safety of GM's Chevy Volt electric car are fading, as the National Highway Transportation Safety Agency has officially closed its investigation into concerns that the batteries in the car could catch fire after a crash. GM has already made some modifications to the vehicle, including adding a coolant temperature sensor, brackets, and shielding. The NHTSA ultimately found that the Volt didn't have any systematic defects, writing that "A defect trend has not been identified at this time, and further investigation does not appear to be warranted." The administration also agreed with GM that the modifications it is making on new models "reduce potential for battery intrusion resulting from side impacts."

With the investigation is now closed, GM is naturally quite happy with the results. It may still buy back your Volt if you're interested in selling as sales have apparently been quite brisk despite the safety concerns.