On 08/14/2012 03:30 PM, Ben Johnson wrote: > In regards to residential areas - I remember last year there was some > talk about the bot that added "50" with the (incorrect) > "maxspeed:source" key = "default residential speed limit in Australia" > and I think there was consensus in the local community that this was a > mistake. > > With remapping some of my local areas, I'm now curious what's best > practice in Australia is for tagging maxspeed on residential streets. > Specifically... > > a) is it even necessary or desirable to explicitly define maxspeed for > every residential way - or should we just presume any > highway=residential is maxspeed=50, unless otherwise stated?
What are we singling out highway=residential? This is where I want to enter the debate as the whole thinking before was just wrong as far as what the legislation actually says and what the map uses as tags for roads. 1. The law :- 25 Speed limit elsewhere (1) If a speed limit sign does not apply to a length of road and the length of road is not in a speed limited area, school zone or shared zone, the speed limit applying to a driver for the length of road is the default speed limit. (2) The default speed limit applying to a driver for a length of road is— (a) for a road in a built-up area—50km/h; or (b) for a road that is not in a built-up area—100km/h. Dictionary entry :- built-up area, in relation to a length of road, means an area in which either of the following is present for a distance of at least 500m or, if the length of road is shorter than 500m, for the whole road— (a) buildings, not over 100m apart, on land next to the road; (b) street lights not over 100m apart. Note that there is no mention of the word residential in the law 2. Guidelines for highway=residential and highway=unclassified The guidelines http://wiki.openstreetmap.org/wiki/Key:highway give the direction that if houses are on the side of a minor road then it should be tagged residential however on the edges of towns and cities you can have such streets as per OSM's definition but they will fail to fulfill the definition as given in Australian law for an Urban Road and thus not have a default of 50kph So when should it be tagged ? In my opinion you should only tag ways that are either signed posted and you tag it with the figure given and appropriate source ref Alternatively if you have observed that a street satisfies the definition given in the road rules for the default to apply then tag it as such and give the source as built_up_area tag if signed maxspeedsource=sign tag if not signed and satisfies the definition maxspeedsource=built_up_area _______________________________________________ Talk-au mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk-au
