[Talk-GB] Visualising speed limits

[Ed Avis]

Andy Allan <gravitystorm at ...> writes:

>I see little point in pointlessly
>adding tags when they there is a sensible default. For example, we
>don't need to tag 98% of roads as "oneway=no", and in the same way we
>don't need to tag 98% of UK residential roads as "maxspeed=30mph".

Such tags don't add much value to the map for users, but they can sometimes
serve as useful meta-information among mappers.  For example I'll often tag
oneway=no on a section of road that joins onto some oneway=yes bits, as an
indication that I have surveyed and established for sure that the one-way system
ends at that point.  (Whereas if the oneway tag is missing altogether, that could
just be because nobody has surveyed the street since it was traced from aerial
photo, so oneway status is unknown.  There is no way to tell.)

Similarly, maxspeed=30mph would be a useful tagging if you have spotted a 30mph
speed limit sign on the ground, or to flag explicitly the point at which some
different speed limit stops applying.

I agree that there is no point bulk-adding such 'default' tags just because they
are the default.

-- 
Ed Avis <eda at waniasset.com>