from what i gather, those symbols (of a bicyclist, specifically *without* a lane marker) are called something else ("sharrows"?) and are intended to remind people to share the lane with the bikes safely, rather than isolate cars and bikes into separate areas.
kind of like, say, crosswalks -- you don't expect cars not to be in them, but you don't expect pedestrians not to be in them, and the signage means you're supposed to check.
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Date: 2010-05-08 11:45 pm (UTC)kind of like, say, crosswalks -- you don't expect cars not to be in them, but you don't expect pedestrians not to be in them, and the signage means you're supposed to check.