See also:

Low speed automatic cancellation
ACC is not functional at vehicle speeds below 16 mph (26 km/h). Once the vehicle speed drops below 16 mph (26 km/h), an audible alarm will sound and the automatic braking will be released. ...

INTERIOR
The MKZ Hybrid's interior is where it really shines. Not literally; it literally shines on the outside with all that chrome. On the inside there's a little shine but mostly some luxury-type touche ...

Resuming the set speed
Press and release the RESUME control. This will automatically return the vehicle to the previously set speed. The set speed will display continuously in the message center while ACC is activ ...