The guy waits and waits and finally decides to drive home. When he gets there, he tells his wife he is going to bed, and to tell anyone who might come looking for him that he has the flu and has been in bed all day.
A few hours later the police knock on the door. They ask if Mr. X lives there and his wife says yes. They ask to see him and she replies that his is in bed with the flu and has been so all day. The police have his driver's license.
They ask to see his car and she asks why. They insist on seeing his car, so she takes them to the garage and opens the door where they find: the police car, lights still flashing.