Honda Accord Sedan 2017 Owner's Manual page 380

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Limitations for Manual Operation
Certain manual functions are disabled or inoperable while the vehicle is in motion.
You cannot select a grayed-out option until the vehicle is stopped.
Only previously stored speed dial entries with voice tags, phonebook names, or
numbers can be called using voice commands while the vehicle is in motion.
2 Speed Dial P. 390
378