I will try this soon, but with no activity the Iphone goes info sleep mode and screen goes dark. If driver is running in the background, and a new alert comes in, does driver show a notification or does the app open?
iPhone's iOS will never force an app to "open". Instead, the app can send a Notification as per your specs in the settings; i.e. Banner, Alert, or None.
The app being open already in the background will not have an affect on Notifications.
Thanks [MENTION=14033]CaptainGizmo[/MENTION] also to add to that it can give you very useful Voice Alerts on your phone or Car Radio while it's running in background.