The progress of automated vehicles can be assessed by computing the average distance driven between "disengagements", when the automated system is switched off, typically by the intervention of a human driver. In 2017, Waymo reported 63 disengagements over of testing, an average distance of between disengagements, the highest among companies reporting such figures. Waymo also traveled a greater total distance than any of the other companies. Their 2017 rate of 0.18 disengagements per was an improvement over the 0.2 disengagements per in 2016, and 0.8 in 2015. In March 2017, Uber reported an average of just per disengagement. In the final three months of 2017, Cruise (now owned by GM) averaged per disengagement over a total distance of . In July 2018, the first electric driverless racing car, "Robocar", completed a 1.8-kilometer track, using its navigation system and artificial intelligence.