“Why do we hang a white cloth in the car window? The secret every driver should know.”

A black Chevrolet Cruze is driving on the road. A white cloth/shirt is tied to the passenger-side rear window and waving. A green sign reads: NEXT EXIT 1 MILE HOSPITAL (Next Exit 1 Mile – Hospital). A blue sign reads ROUTE 9. The text below reads:
“WHAT IS THE SIGNIFICANCE OF A WHITE CLOTH HANGING FROM A CAR WINDOW WHILE DRIVING?
AND WHY IS IT IMPORTANT FOR EVERY DRIVER TO KNOW?”