Consumer Watchdog, a consumer advocacy group, says that state of California data shows “robot cars aren’t ready to be turned loose” on highways without humans involved.

“The most recent required public ‘disengagement reports’ in California show Waymo’s robot cars aren’t ready to roam the roads without a human driver monitoring them,” said John Simpson, Consumer Watchdog’s Privacy Project Director. “There is no such public information in Arizona. [Waymo] CEO John Krafcik is simply asking us to trust him as he uses public roads as a private laboratory. That’s simply not good enough.”

Krafcik announced earlier Tuesday that Waymo will allow the public to start riding in the fully self-driving vehicles in the next few months. The trips will take place in Phoenix, Arizona, where Waymo has already been testing its technology.

Consumer Watchdog said California “disengagement reports” released earlier this year found that Waymo technology failed 124 times in 635,868 miles. “Waymo said disengagements declined from 341 in 2015 to 124 in 2016, or 0.8 per 1,000 miles compared to 0.2 per 1,000 miles. While there has been an improvement, the reports show the robots simply aren’t ready to be released to roam our roads without human drivers,” the group said.

“Putting robot cars on public roads without any kind of driver’s license amounts to giving the manufacturer a license to kill,” he added.

“The public has right to know what programming decisions have been made in the robot car’s software, for instance, who gets priority in a crash? Is it the passengers or a pedestrian?” said Simpson. “How often does the robot technology fail? How many jobs will it steal? The public deserves answers. ‘Trust us, we’re Google’s Waymo,’ simply doesn’t suffice.”