Hello keepright!

Thanks for your kind answer to which have a few comments.

1) I agree with you that driveway should not be used in this way. I have had this discussion with others, and we agreed on using landuse=garage or garages for areas in front of a garage or garages.

Regarding driveways to single houses, they are very rarely mapped in Denmark. Driveways like these are self evident when they are directly placed next to a road with common access.  

2) Yes, F4 Demo doesn´t render the height of steps, so it will be best to use height as relative to normal ground (0 meters).

I agree with you, that stairs shall be used only indoors, and steps shall be only br used outdoors. I haven't been consistent but I will take notice and attempt to correct this from now on.

3) Yes, you're right. Building=portal is used by me to obtain proper rendering in 3D. 

The OpenStreetMap definition of buiding is quite wide, but a portal still is a fixed man made construction. For that reason I consider the use of building=portal for acceptable.

4) The same goes for building=steps. They are fixed man made constructions, and there are examples of how steps are rendered in the same manner as I do.  

Please check out this link:
https://www.openstreetmap.org/edit#map=20/43.8382446/4.3562270

For that reason I consider the micromapping of building/building_part=steps for acceptable. Not that everyone absolutely should map steps like me. Only in order to make steps rendered in the best possible way in 3D.

My best regards
Michael alias MicDK
