For years, Tesla $TSLA has proudly paraded its advanced driver assistance system, Full Self-Driving as being the real deal. It’s claimed the system can navigate traffic, manage highway driving and repeatedly claimed it’s the future of driving, despite the number of crashes, collisions and even deaths linked to the system mounting. Now, a new study has looked into just how far the system can actually drive before needing assistance from a human, and it’s not very far.

