[OHM] Modifying the default renderer

[sk53.osm]

I've been looking at the Seattle data and feel a bit dissatisfied with how
the data looks. I realised that my issue was the early grid being
represented as tracks.

I believe that we should try and use a functional classification of
highways for all historical periods, and keep the actual physical condition
(whether a residential street is a muddy trackway, a narrow alley filled
with ordure or a stone paved road with raised sidewalks) in distinct tags.

For most historical periods values of highway=motorway, trunk, motorroad
will be irrelevant, but I think there will always be at least two classes
of highways loosely corresponding to longer distance roads, and local
routes: for now I would suggest continuing to use primary/secondary. I'm
not sure that tertiary is relevant in the pre-car age. We should also
consider whether specific tags are needed for pack-horse trails & mule
paths: the remnants of both are common across Western Europe, usually now
tracks or bridleways.

Whatever tags are used I think the appropriate cartography for main
highways needs to be much more muted that what I've learnt is the "Telly
Tubby style". One potential point of inspiration is the cartography of
older editions of the Ordnance Survey's Roman Britain map (extract
here<http://www.bibliographics.com/MAPS/BRITAIN/BRIT-MAP-FRAME-25.htm>).
WIth a single cartographic style covering multiple periods I think we
should aim to be fairly conservative. Furthermore there are many style
rules which can be removed.

Obviously any changes should wait until the main OSM site goves over to the
CartoCSS style sheet. However, I think it's worth kicking off a discussion
about both tagging & cartography at this point, before too much data is
entered. So far it's only highways which have caught my attention: there
may be some other feature classes which need a more period-neutral
cartography.

Regards,

Jerry

PS. I'd love to hear a resume of the BoF session in SF.
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