Here is a four wheeled motorcycle demonstrated in this video on some British TV show. Some of the choice quotes from the video are of the host of the show saying how in the air intake at the back of the car behind the driver's head feels like it is sucking his brains out through his ear. There is no windshield and no external body to speak of on the car. In addition it has a small (what looks like) and 8 inch square "boot" (trunk) in the front hood area of the car. Near the end of the video they rate how fast the car is in relation to other road worthy cars and it beats everything on their list except the Porsche GT.