Am 19.09.2011 13:29, schrieb Nathan Edgars II:
Can someone give an example of a case where the number of lanes, including turning lanes, on a road would be more useful than just the through lanes, and where another tag (such as width) would not be even more useful? I'm unable to think of such a case.
Traffic simulation (e.g. by cellular automata) is a use case for this. At crossroads it can make a huge difference for traffic engineering to know if a (turn) lane can contain 3 or 30 vehicles. To determine the "capacity" of a turn lane one would need information about its length - and one would get this easily if start and end point of the lane are known. Otherwise one would have to tag something like "turn_lane_left_1=xx" and "turn_lane_left_2=yy" (indicating length or capacity or whatever) in case of two turn lanes with different lengths.
Seoman
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