I came across short on YouTube labeled Guys Driving Without Cars. A little detective work and guessing on imdb.com led me to the official title of Stop Look And Listen (1967) by Len Janson and Chuck Menville. It's a funny little stop-motion video, about 5 minutes long.
http://www.youtube.com/v/DREpQAPeu2I&hl=en&fs=1
http://www.youtube.com/watch?v=DREpQAPeu2I (http://www.youtube.com/watch?v=DREpQAPeu2I)