Both the Tesla Model S and X are Autonomous Level 3 capable:

"The driver can fully cede control of all safety-critical functions in certain conditions. The car senses when conditions require the driver to retake control and provides a "sufficiently comfortable transition time" for the driver to do so."

https://en.wikipedia.org/wiki/Autonomous_car#Classification

Its expected their Model 3 mass market vehicle will contain the same, if not a greater level, of driving automation.

Disclaimer: I've traveled down the interstate in a friend's Model S for ~2-3 hours at a time at ~85mph in autopilot mode with no intervention required.