A self-balancing, fully autonomous driving system developed by Google’s robotics group has a price tag of more than $6 million, according to a new study by researchers at Stanford University.

The system, dubbed “Google’s self-driven car,” uses radar, cameras, and lasers to detect objects and steer itself to avoid hazards in traffic and on roads, according a statement from the company.

The $6.6 million price tag was part of a research study led by the Stanford Research Lab that found the system could perform at a range of speeds of up to 150 miles per hours, but it would also need to be able to navigate a range on a street, or at speeds of more like 120 mph, the Stanford statement said.

The researchers found the self-altering system would require a range in excess of 50 miles per day, which is less than half the range of current autonomous cars, according the statement.

The self-moving car could use a combination of cameras and lasers, and would require an onboard computer to navigate the road.

Google said it has not yet tested the system on public roads, but that it would be “working on it,” the statement said, adding that the system would not be able “to do a complete lap around the city” and could not be used for emergency response.

It is not clear whether Google is planning to make the system commercially available.