A example of your first point: Road narrows signs. In my home state of IL, they ...

		likpok on Feb 4, 2009 \| parent \| context \| favorite \| on: Taking Traffic Control Lessons - From Ants A example of your first point: Road narrows signs. In my home state of IL, they always (in moderately congested traffic) lead to jams. In MI, they didn't seem to (I have not collected much data there, however), as MI has a law about getting over when you first see signs, not getting over when the lane ends.