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].
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?). 3. Based on the recent conversation about source:*=*, when I tag a way with maxspeed=*, I've been adding source:maxspeed and source_ref:maxspeed as well. Example: - I photograph (ref1) a speed limit sign at point A, saying 40 mph. - I create a node on the curb of the road at point A, tagged: maxspeed=40 mph source=survey;image;usgs_imagery [2] source_ref=ref1 - I photograph (ref2) the very next speed limit sign I see - at point B, saying 35 mph. - I create a node on the curb of the road at point B, tagged: maxspeed=35 mph source=survey;image;usgs_imagery [2] source_ref=ref2 - I split the way so that I have a segment between point A and B. - I tag the segment: maxspeed=40 mph source:maxspeed=survey;image source_ref:maxspeed=ref1;ref2 If I see additional identical speed-limit signs along the way, I tag the nodes, but do not split the way. I tag the way with the refs for the endpoints only. 4. Similarly, for school zones, I'm tagging the ways: maxspeed:children_present=25 mph source:maxspeed_children_present=survey;image source_ref:maxspeed_children_present=ref1;ref2 I changed the ":" to "_", not being sure if we want to deal with multiple levels of children. 5. For separate limits for trucks, I'm using: maxspeed:hgv=* source:maxspeed_hgv=* source_ref:maxspeed_hgv=* 6. For separate limits for towing/towed vehicles, I'm using: maxspeed:towing=* source:maxspeed_towing=* source_ref:maxspeed_towing=* In CA, the standard speed limit on freeways is 65mph normally, but 55mph for trucks and towing/towed vehicles. This results in 9 tags(!), providing more reason for some sort of scheme like maxspeed=freeway. 7. Similarly, for truck routes, I create a node for the signs, tagged: hgv=designated source=survey;image;usgs_imagery source_ref=ref1 and tag the ways: hgv=designated source:hgv=survey;image source_ref:hgv=ref1 For bike routes, the same, replacing hgv with bicycle. 8. In rural areas especially, there is often confusion between county records, existing databases (e.g. TIGER, TeleAtlas), and posted signs, as to what portion of a road is considered "private". This is an area where I believe OSM and actual in-person surveying has the potential for great value over other maps. I'd like to create a node where I first see a "No Trespassing" sign (http://en.wikipedia.org/wiki/File:No_trespassing_sign.jpg). Should I tag the node access=private [+source=* +source_ref=*]? I'll note that JOSM has an icon for access=no, but not access=private. I can then tag the way with source:access=* +source_ref:access=*. Notes: [1]That is, holding that the sign states what is taken to be the prima facie safe speed. Any traffic court judges here? [2]survey because I saw it, image because I photographed it, and usgs_imagery because I used it to find the curb. -- Alan Mintz <[email protected]> _______________________________________________ Tagging mailing list [email protected] http://lists.openstreetmap.org/listinfo/tagging
