This plug-in allows you to control Scanner Radio Pro using the Locale app.
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.