Part 2: Criminal liability for vehicle use Chapter 1: Legal position of the user-in-charge Section 46: Meaning of "user-in-charge"
This section sets out that references to an individual as a "user-in-charge" in Part 2 of this Act mean that the vehicle is an authorised automated vehicle with an authorised user-in-charge feature; that the feature is engaged and that the individual is in the vehicle, and is in a position to exercise control of the vehicle, but is not controlling it.  A driver becomes a user-in-charge when they engage a user-in-charge feature.