Waymo, “We started as a Google project in 2009, and have self-driven more than 3.5M miles to get ready for this moment”, Twitter, March 13, 2017, https://twitter.com/Waymo/status/862077212740145152?– ref_src=twsrc%5Etfw&ref_url=http%3A%2F%2F9to5google. com%2F2017%2F05%2F09%2Fwaymo-miles-3-million-may%2F
