A safety group graded 14 driver-assistance systems. Tesla's self-driving option was the worst.

• Automated driving systems are lacking in the safety department, according to a new report.
• Tesla's Full Self Driving system earned the worst marks, but most of the 14 systems tested poorly.
• Some say that autonomous and assisted driving systems are responsible for fatal crashes.

You may want to think twice before flipping on your autonomous driving system on the highway.