TOM KRISHER AP Auto Writer The Trump administration on Wednesday unveiled its most recent round of guidelines for autonomous vehicle makers that rely on voluntary standards despite calls for specific regulations. Transportation Secretary Elaine Chao announced the proposed guidelines in a speech at the CES gadget show in Las Vegas, saying in prepared remarks that "AV 4.0" will ensure U.S. leadership in developing new technologies But the guidelines fall short of expectations of auto safety advocates and the National Transportation Safety Board. In November, the NTSB, which investigates crashes and makes safety recommendations, condemned a lack of state and federal regulation for testing autonomous vehicles. The NTSB said Chao's department failed to lead in regulating the new tec
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