On 3/26/2012 7:47 AM, Martin Vonwald wrote:
I took the notation from the wikipedia page linked in the proposal.
I don't know why Wikipedia groups them, but it at least doesn't say that
a center turn lane is a reversible lane.
http://mutcd.fhwa.dot.gov/htm/2009/part2/part2b.htm#section2B24
"Two-Way Left Turn Only (R3-9a or R3-9b) signs (see Figure 2B-6) should
be used in conjunction with the required pavement markings where a
*non-reversible* lane is reserved for the exclusive use of left-turning
vehicles in either direction and is not used for passing, overtaking, or
through travel." (emphasis added)
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