[Tagging] usage of maxspeed:practical is described as recommended on wiki

[Martin Koppenhoefer]

>> On Mon, Aug 25, 2014 at 10:43:36AM +0200, Pieren wrote:
>> ...adding at the end a note saying that a large part of
>> the community consider these two tags -smoothness and
>> maxspeed:practical - too subjective.



I don't think smoothness is too subjective or anyhow comparable to maxspeed:practical - it may be badly defined and may have strange proposed values, but I think it can still be handled somehow and is generally suitable for the db (can be defined objectively) while practical speed is not.


cheers 
Martin