[OSM-newbies] Secondary vs tertiary roads

[Richard Endersby]

Hi 
 
I'm preparing to do some mapping and to fill in some gaps in the minor road
network in mid bedofrdshire (UK)
(http://www.informationfreeway.org/?lat=52.03892808416901
<http://www.informationfreeway.org/?lat=52.03892808416901&lon=-0.32186501209
207824&zoom=13&layers=B000F000>
&lon=-0.32186501209207824&zoom=13&layers=B000F000) - an area I know fairly
well. On looking at the map I saw that quite a few of the roads are tagged
as secondary even though they are what I would call minor roads with no road
classification (ie not A, B or C roads). I've been tagging such roads as
tertiary or unclassified up until now
 
Two questions 
 
1 I assume that this highway=secondary refers to 'B' roads in the UK. Is
that correct? Anything that is not a B road should be tagged with something
else?
2 Is there any protocol in changing another author's work as far as the tags
are concerned?
 
Thanks
Richard
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