Car 54 - Wow - that brings back memories. The third cop was played by Al Lewis, aka Grampa Munster.
http://imdb.com/title/tt0054528/
http://mywebpages.comcast.net/csmiths/sketches.html
Car 54 (the one with wheels) was painted red & white, so when filming on location, they wouldn't be mistaken for real police. The show was shot in black & white, so the viewers never noticed.
