[Routing] Derive data: number of lanes and capacity

[Marcus Wolschon]

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.

Marcus