https://www.reuters.com/article/tesla-investigation/u-s-ntsb-head-criticizes-tesla-over-vehicle-self-driving-feature-idUSKBN2HF14C >WASHINGTON (Reuters) -The head of the U.S. National Transportation Safety Board on Monday criticized electric carmaker Tesla Inc's decision to provide new self-driving software to vehicle owners without addressing safety concerns that the agency raised after a series of fatal accidents.