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Tech entrepreneur Elon Musk (R) discusses a vision of cars being lowered into tunnels to travel efficiently and eliminate traffic congestion with curator Chris Anderson (L) at a TED Conference in Vancouver, Canada, April 28, 2017. / AFP PHOTO / Glenn CHAPMAN (Photo credit should read GLENN CHAPMAN/AFP/Getty Images)

Tech entrepreneur Elon Musk (R) discusses a vision of cars being lowered into tunnels to travel efficiently and eliminate traffic congestion with curator Chris Anderson (L) at a TED Conference in Vancouver, Canada, April 28, 2017. / AFP PHOTO / Glenn CHAPMAN        (Photo credit should read GLENN CHAPMAN/AFP/Getty Images)