[Talk-us] U turn restrictions in areas

[Paul Johnson]

On Tue, Aug 18, 2015 at 12:00 PM, Tod Fitch <tod at fitchdesign.com> wrote:

> prima-facia speed limits in most of the US


At least with relatively simple examples (such as the county-wide and
city-wide speed limits found commonly in Oklahoma, Kansas, northern Texas
and southeastern Colorado, posted once at the boundary and assumed for the
entire interior space unless otherwise posted), it's reasonably feasible to
tag all ways larger than a footway that isn't private or permissive or
already have a maxspeed within the boundary polygon with a maxspeed and a
maxspeed:note explaining the situation.  On the other end of the
spectrum, Oregon
makes it hard with multi-tiered prima-facia speeds
<http://www.oregon.gov/odot/hwy/traffic-roadway/pages/speed_zone_program.aspx#Speed_Zone_Standards>
.

Of course, the above gets turned on it's head with du jure speed limits
that are posted, since the Oregon Department of Transportation is in charge
of all speed limits in Oregon and makes every single speed zone order
statewide public record in excruciating detail
<http://www.oregon.gov/odot/hwy/traffic-roadway/pages/speed_zone_program.aspx#Speed_Zone_Orders_On_Line>,
which might make for a Very Hard or Expert level Maproulette.  Oklahoma
doesn't publish speed orders and OklaDOT only sets speed limits on state
highways.  Oklahoma Turnpike Authority sets speed limits on the turnpikes.
Local counties have their own speed limits that the local cities often
override.  It basically takes a *lot* of observation and local knowledge to
get things to a level where things are reasonably accurate (after 4 years
of hard work, I have around a dozen Oklahoma counties completely tagged
with speed limits, with a modulo of locations where I'm not sure what the
posted limit is, just what the presumed prima facia is on a vast *minority* of
ways, almost all of which are going to be within some moderately small
towns (probably lower) or state highways (probably higher).
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