The document provides instructions for what to do if experiencing a heart attack while alone in your car. It advises to not panic, but instead start coughing repeatedly and taking deep breaths before each cough. This should be done every two seconds without stopping until help arrives or the heart regains its normal rhythm. Coughing and deep breathing helps get oxygen to the lungs and keeps blood circulating by squeezing the heart, which can help it regain its normal rhythm. Spreading this information could help save lives as heart attacks can affect people of all ages.