[Tagging] Dispute prevention: meaning of lanes tag

[Martin Vonwald]

The "narrow road" example was clearly the wrong image. I changed that
to lanes=1 and added a photo from Philip Barnes as example for a
narrow two-lane road.

Further I removed the assumptions for two-way motorways/trunks, as it
is recommend to map their carriageways as two separate way.

Anyone else has a problem with the suggested solution to the lanes=1.5
problem? And should I add a recommendation to always tag the lane
count, also e.g. for residentials?

Martin