Today I noticed that iOS9 B1 appears to have a Notification option for some Bluetooth devices. Some car systems support this and any and all notifications that occur while in the car now come over the car radio as well as notifications. They appear in the same manner as Messages that can also appear on car Bluetooth systems.
One can turn these on/off within the Bluetooth Settings area for a specific Bluetooth device that supports it.
One can turn these on/off within the Bluetooth Settings area for a specific Bluetooth device that supports it.