Hi,
Both on OSM and in the Real World™, I've done a lot of work on speed limits.
In
http://www.dttas.ie/sites/default/files/upload/general/Guide_Speed_Limits_Mar_2015.pdf
there are two models for writing speed limit bye-laws:* Dunmanway model - draw
a line around the zone and everything inside is speed limit X and * Buttevent
model - a list of roads whose speed limits are X.
When the 30 km/h zone was being expanded in central Dublin about 2005, one of
the problems was the list of named streets ran to about 300, which was
unmanageable. The decision was made to adopt the Dunmanway model, with a list
of exceptions. That zone is coloured green here:
http://product.itoworld.com/map/124?lon=-6.25884&lat=53.35106&zoom=14&fullscreen=true
Note that the road signage is generally 0-30 metres inside the legally defined
zone,
For OSM purposes, the big problem is that the number of ways far exceeds the
number of named streets. Grafton Street alone is made up of 7 ways. It would be
very useful for someone to create a method that would apply speed limits to all
(public) roads within a zone.
Colm
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