From the TV Tropes page on rubbish special effects:
Knight Rider: The obligatory Turbo Boost sequences were frequently convincing, but were just as frequently lame, including at least one instance where, rather than a stunt car, what we see is plainly a matchbox toy being tossed over a miniature set — an effect made worse by the fact that, like most Knight Rider merchandise, the matchbox car had the words "KNIGHT 2000" printed on it in large red letters.