Ralph Bakshi's whole career is a big, messy middle finger to people who say cartoons are only for kids. His movies aren't pretty — in fact, they're usually the opposite — but that's kind of the point, and his bawdy, brawling patchwork of inner-city life exemplifies that. It was his second X-rated feature, and while it usually gets overshadowed by its predecessor Fritz the Cat, Heavy Traffic was really the place where Bakshi got to express himself in all his ugly glory.