[Tentakill]

My driving instructor and parents all told me that driving in the left lane when not passing is illegal and that people who do it are dickheads. I see signs reminding people to stay in the right lane when not passing on a regular basis.

Is it just the state I live in (WA) or is the rule not as solid as I thought?

[prostoalex]

It seems like even in WA the "Slow Traffic Keep Right" is more of a suggestion than a hard rule. There's also subjective interpretation of the rule - someone driving 71 in a 70-mph speed limit zone might not qualify themselves as slow, while someone behind who's okay with going 80 mph might disagree.