Get ready to throw away your car key. Correspondent Mark Chace reports Volvo is experimenting with letting drivers use nothing more than a smartphone app to start their cars: https://www.wjr.com/wp-content/uploads/sites/112/2016/02/MP3_BC-.mp3-Westwood-News-WWO_0008_WW1-0002-23-2016-02-52-12-Chace-Volvo_Digital_Key_App.mp3