Mike, ya nailed it. We drive two days on I-5 north to Canada to visit the folks. For some bizarre reason there's this gaggle of people who think it's just fine to get on the highway and sit in the left lane on a two lane interstate at five miles below the speed limit, when the signs say slower traffic keep right. The signs should all be replaced with: Use left lane for passing only. Not that these yahoos would care.
And they actually slow down when they're passing trucks instead of goosing it to clear the danger zones. Jerks. Don't get me started on rain and snow conditions.
OK, I feel a bit better now...