So why do people insist on driving slower than the norm in the fast lane? Even on a highway with four lanes in the same direction...why do some people pick that lane to drive at their own pace? Is there something vague about the term "Slower Traffic Keep Right" (in the USA)? Are they using it as a personal statement on the speed of traffic? Do they prefer hugging the far left as a lane reference? If you know someone like this...why do they do it?