engadget: Waymo returns safety drivers to its autonomous cars

"Within the last few weeks, Waymo has put safety drivers back behind the wheels of its more advanced vehicles, which have been operating without such drivers for some time, and across its broader fleet, the company has added co-drivers to its daytime shifts as well as its night time shifts. The co-drivers are part of Waymo's effort to keep its safety drivers alert, and The Information reports that the company has also been installing cameras aimed at drivers' faces for the purpose of monitoring when they might be nodding off."

https://www.engadget.com/2018/11/27/waymo-returns-safety-drivers-to-autonomous-cars/