[Tagging] Counting lanes: include merging or turn lanes?

Stephen Hope slhope at gmail.com
Mon Jul 5 09:22:36 BST 2010


On 5 July 2010 12:21, Alan Mintz <Alan_Mintz+OSM at earthlink.net> wrote:
> I see the lanes tag
> being useful primarily in determining likely speed possible in making
> routing decisions, other factors being equal. It could also be useful in
> rendering. Neither would seem to sway me to add the extra lane for such a
> short distance.

One other possible use of lane tags is in routing.  If, at an
off-ramp, the number of lanes changes from 3 to 2, you could assume
the outside lane was forced down the offramp.  Some routing software
warns of such exits (as opposed to those where you must turn off to
leave the main road).

Stephen




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