[OSM-talk] Mapping well-known area: ok to guess?

[Frederik Ramm]

Hi,

     found myself mapping a very well-known residential area where roads 
are not grid-like (rather crooked) but still very much parallel to each 
other; didn't have a GPS track for one in the middle, so just drew it in 
  so that it fit with the others.

Do you think that (a) this is perfectly ok, (b) this should not be done 
as it pretends to have an accuracy which isn't there, or (c) can be done 
but should be tagged somehow? If (c), what would you use? "source=gut"? 
"note=guessed"?

Bye
Frederik