FILE- This July 14, 2015, file photo shows the ARC Automotive manufacturing plant in Knoxville, Tenn. Nearly four years ago, the U.S. government’s highway safety agency began investigating air bag inflators made by ARC Automotive of Tennessee when two people were hit by flying shrapnel after crashes. A public records posted by the agency show little progress on the probe, which began in July of 2015 and remains unresolved. (Adam Lau/Knoxville News Sentinel via AP, File)
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