[Routing] Derive data: number of lanes and capacity
Paul Johnson
baloo at ursamundi.org
Sun Aug 8 18:57:58 BST 2010
On Thu, 22 Jul 2010 13:18:15 +0200, Marcus Wolschon wrote:
> Tom Müller wrote:
>>> There is an explicit tag
>>> lanes=<number>
>>> http://wiki.openstreetmap.org/wiki/Key:lanes
>
>> yes. I know. But it's set pretty rarely. For Berlin it's set for
>> approx. 6% of all highways ... So I was just wondering if there are any
>> defaults which are deriveable by the highway-type or so?!
>
> I would assume that all highway=* to be lanes=1 (residential, secondary,
> service,...) except motorways with lanes=2
>
> Maybe highway=primary be 2 lanes too.
There's a lot of one-lane-each-way primaries in the US. And thanks to
some continent-wide data torquing by NE2, a lot of one-lane-each-way
trunks. The former's a fact of life, America has a lot of extremely
rural primaries running through badlands, mountain peaks or otherwise
just don't require extra capacity despite connecting cities. The latter
probably needs to be solved with a ban.
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