Both the Tesla Model S and Model X have a valet mode that can be activated when necessary. This mode, when activated, limits motor output and top speed:

  1. Maximum speed is limited to 70 MPH (113 kmh)
  2. Maximum performance is limited to 80kW.

There are a whole slew of other privacy related changes when valet mode is activated too, but the main purpose of this mode is to prevent a valet driver from joyriding in your car.

So, how does valet mode work? This video provides a rather comical comparison between valet mode on/off in a Tesla Model X.

Video description:

"Beware of the evil valet parker! Watch to see the difference between the Tesla Model X when valet mode is on, vs when it isn't."