Deaf lady in trouble

One day a lady was driving on the Highway. She frequently checked her speed gauge to make sure she stayed within the speed limit. However, when she looked into her rear mirror, much to her dismay, she saw a police car not far behind! And, to make matters worse, the police car turned on his flashing lights. She thought to herself, "Uh-oh, what have I done now? I'm not speeding. I'm not drinking. I have my seat belt on! I have kept up my license dues and everything!"
So, she pulled over and the police car pulled over to the side right behind her car. She drove her car slowly to a stop, slowly rolled down the window, and prepared for a ticket when she knew she didn't deserve it. A policeman walked up to her window, and spoke to her. The lady pointed to her ear and shook her head, meaning she was deaf. The policeman smiled slightly, and knowing sign language, signed back, "I know. I'm here to tell you that your horn is stuck."