On 9/18/2011 2:19 PM, Toby Murray wrote:
My take on lanes is that it should be the number of continuous lanes along a road. This impacts traffic flow and road capacity which allows routers to make more informed decisions. Turning lanes don't increase overall road capacity. Rather, they prevent it from dropping at busy intersections. As such, I do not split and tag ways where turning lanes are. I could see turning lanes being useful information though but lumping them in with the total lane count actually obscures information. I would rather see them tagged with lanes:turning:left=1 or something like that. That way you know exactly what is happening and routers could easily say "get in the left turning lane.
This is pretty much my view too. The one application where I can see the total number of lanes being important is for a pedestrian crossing the road, and here it would probably work better as a tag on the crossing node. (And what really matters isn't the number of lanes but the width, AKA the length of the crossing.)
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