Autonomous-driving startup Drive.ai has released its 2017 "autonomous vehicle disengagement report." These reports are mandatory for companies testing self-driving cars in California, listing important information like miles driven and the number of incidents that occurred while covering those miles. According to its report, Drive.ai The company's self-driving cars covered 6,572 miles in autonomous mode last year, according to the report, but they also disengaged from autonomous mode 151 times, requiring a human driver to take over. But Drive.ai also claims that its seven autonomous cars weren't involved in any crashes and that the number of miles driven between disengagements was increased significantly, from around three miles in 2016 to around 100 miles in November 2017. Drive.ai received its permit to test self-driving cars on California roads in April 2016.