Tesla CEO Elon Musk spoke last month during an investor earnings call. An earlier version misstated the timing. It was reported last Monday that Tesla passed a significant milestone to roll out its advanced driver assistance technology in China amid a visit by Musk. An earlier version misstated the timing. Ford CFO John Lawler spoke to the media last month during an earnings briefing. An earlier version misstated the timing. GM CEO Mary Barra recently visited China. An earlier version misstated the timing.