(Bloomberg) -- US auto safety regulators are investigating Ford Motor Co.’s BlueCruise driver-assistance feature after a pair of fatal crashes involving the technology. Most Read from BloombergTesla Soars on Tentative Approval for Driving System in ChinaYen Sparks Intervention Suspicion After U-Turn From 1990 LowsStocks Trade for 390 Minutes a Day. Increasingly, Only 10 MatterMusk Makes Surprise China Visit in Search of Tesla Revenue BoostElliott Built ‘Large’ Stake in Buffett-Favored Sumitomo,