Washington, DC (CNN Business) Tesla is selling its cars with the option of "full self-driving capability," a feature that's drawing criticism from experts on self-driving technology. They say CEO Elon Musk is playing fast and loose with definitions, overselling the technology and potentially creating safety issues.

When Tesla announced the $35,000 Model 3 Thursday, it said it would come with an optional $5,000 feature: full self-driving capability. The system will offer "automatic driving on city streets" as an update later this year, according to Tesla's website.

A Tesla spokeswoman declined to comment on details around the automatic driving option, and pointed CNN Business to fine print on Tesla's order page that tells buyers the currently enabled features require "active" driver supervision and do not make the vehicle autonomous.

Experts say Tesla's "full self-driving" feature is really a partial self-driving feature that handles minor driving tasks such as keeping pace with other cars on a highway and still requires diligent human oversight. To most autonomous vehicle experts, "full self-driving" means a car in which a person could safely fall asleep behind the wheel, and the steering wheel and pedals aren't even needed.

The Self-Driving Coalition for Safer Streets, a group that lobbies on behalf of some of the largest companies competing in the autonomous driving space, such as Waymo, Volvo, Ford, Lyft and Uber, defines self-driving vehicles as those that don't require a human to take control in a given area, such as a city.

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