[Tagging] US Speed Limits, truck routes, bike routes, access

Richard Welty rwelty at averillpark.net
Fri Feb 26 23:29:48 GMT 2010

On 2/26/10 5:32 PM, Alan Mintz wrote:
> Several issues with relation to speed limits:
> 1. How should one tag "suggested" speeds (usually around curves) like
> http://en.wikipedia.org/wiki/File:MUTCD_W1-4.svg with
> http://en.wikipedia.org/wiki/File:Advisory_Curve_Speed_English_25.svg ?
> Should I tag them as maxspeed=*? I can see being cited for exceeding it
> according to the blanket "safe speed" provisions in some vehicle codes[1].
i wouldn't try to derive maxspeed from a black-and-yellow "suggestion". 
mostly they'd be
used in the aftermath of an accident, that is the officer would cite 
someone for unsafe
speed as part of assigning blame.

now Massachusetts is interesting (and to my mind, silly.) they 
frequently don't use the
black-and-yellow signs, they just use conventional black-and-white speed 
limit signs
to mean the same thing. you'd pretty much have to use maxspeed for 
those. this would
mean a lot of short ways, as i've seen long curves where they stepped the
speed down 5 or 10mph at a time.
> 2. I've been tagging 25 mph school zones
> (http://upload.wikimedia.org/wikipedia/commons/d/db/SchoolZone-SpeedLimitSignAndLight.JPG)
> as "maxspeed:children_present=25 mph". Can someone comment on where such
> zones end (I realize this may, again, be jurisdiction-dependent)? I
> sometimes, but not always, see an "End School Zone" sign (should I tag
> these, and how?).
i would normally look for the matching school zone sign for traffic from 
the other direction.


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