This is a plug-in for Locale and Tasker that can be used to have the Scanner Radio Pro app automatically perform various actions such as start playing one of your favorite scanner feeds, automatically stop playing a scanner, display your favorites, or display nearby scanners based on certain conditions occurring.
Using this plug-in, you could have Locale or Tasker automatically have Scanner Radio Pro start playing a scanner when a Bluetooth connection is established with your car and have it automatically stop playing when the connection is lost.
This plug-in will control only Scanner Radio Pro. If you want to control Scanner Radio, you need to install "Scanner Radio Locale Plug-in", also available for free in the Google Play Store.