On Sat, Sep 19, 2009 at 11:37 PM, John Smith <deltafoxtrot...@gmail.com>wrote:
> 2009/9/20 Anthony <o...@inbox.org>: > > This can be done without resorting to mapping each lane separately. If > you > > have a three lane road with no lane change restrictions or physical > > barriers, you map it as one way, with three lanes, with the position as > the > > center of the three lanes. When the road goes to two lanes, you map it > as > > one way, with two lanes, with the position as the center of the two > lanes. > > I wasn't suggesting to map each lane separately, however an editor > could display lanes and it would be so much better to display them as > parallel ways which could be edited if they needed to be. > That's an editor issue. If the editor wants to display lanes in a single way as parallel ways, and let you edit them if need be, it can do that. All that's needed is an unambiguous way to represent all the various scenarios. There are some issues where I think your method of using a single way is appropriate (per lane speed when traffic is free to change lanes freely is the only one I can think of at the moment though), and some issues where I think using a single way is completely inappropriate (per lane access restrictions, per lane geometries, per lane turn restrictions). I should be able to run a shortest path algorithm on a single set of nodes and edges. Add whatever features you want to that, but don't take that away.
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