FORD 2011 Fiesta v.2 - Manual (Page 104)

Volume Setting
Do not raise the volume excessively. Keep the volume at a level where
you can still hear outside traffic and emergency signals while driving.
Driving while unable to hear these sounds could cause an accident.
Use of Speech Recognition Functions
Speech recognition software is inherently a statistical process which is
subject to errors. It is your responsibility to monitor any speech
recognition functions included in the system and address any errors.
Entertainment Systems
104
2011 Fiesta (fie)
Owners Guide, 2nd Printing
USA (fus)