the idea is that they cross the centreline to avoid the cyclist, meaning waiting for a gap in opposing traffic. people around my area, particularly transport trucks, are actually quite accommodating - i very seldom have someone pass right off my shoulder even when there is no paved shoulder...which there typically isn't. i choose not to ride through town on my TT bike for safety reasons, so i'm out pedaling on 80kph/50mph secondary highways through farmland where you're lucky if there's even a white line instead of the pavement just crumbling away into gravel at the side of the road.
unfortunately, i'm sure that for the folks who "have important places to be", they will either not bother to slow and look for an opportunity to pass safely, or get torqued about it and possibly pull an aggressive move on the cyclist that is "obstructing" them. as said above, though, i'm lucky to live in a place where a lot of people seem to "get it" and will give a lone cyclist on the side of a narrow country road a wide berth.
cheers!
-mistress k
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ill advised racing inc.