Turning on the Driving Focus helps you stay focused on the road. When you turn it on, text messages and other notifications are silenced or limited. You can at the top right, then tap Driving.
Tap Focus Status, then turn on Share Focus Status.
Tap Auto-Reply, then choose who should receive an auto-reply when the Driving Focus is on:
No one
Recents
Favorites
All Contacts
You can edit your auto-reply message to customize it.
Then tap View and respond to notifications on iPhone