Over the past six years, Google’s self-driving cars have accrued an equivalent of 75 years of US adult driving experience through test runs, with just 11 minor fender-benders. Now, the driverless vehicles are set to take to the publics roads of Mountain View, California—Google’s home town—for further testing. Each car will be capped at a 25 miles-per-hour maximum and will be accompanied by a driver who can access the gas, brakes and steering wheel. By releasing them into the public, Google hopes to better understand conditions unique to self-driving vehicles. Look for them this summer.