IMHO setting a speedlimit does not do a good job for every case. Does it count for bicycle riders? Does it count for motorbike riders? Does it count for pedestrians?
OSM, as I understood, aims at being a universally usable source for orientation and routing for every type of traffic. Reasonable speedlimits are very individual. They depend on the driver's/rider's skills, the vehicle used, the way's inclination, load, daily mood and goal aimed at. Think of a lorry, filled with the driver's furniture, crossing a mountain pass. Compare it with a motorbike, rider and sozius, packed with tent and air mattresses, on a holiday trip through the Schwarzwald. Or have a look at a couple on a tandem bike, crossing the Swiss Alps in their holidays - or the Netherlands. As a hint for speed, the vehicle type, the street's width, the count and shape of curves and the current traffic situation are much more reasonable. I have some ideas for judging the shape of a curve, but am not capable to make a code example. Maybe someone already has some programming experience and likes a trial? The task is not really profane and depends highly on the quality of the OSM-data, but I think it should be possible to write an interface for judging a way's shape independent of the vehicle type. -------- Original-Nachricht -------- > Datum: Sun, 7 Dec 2008 12:50:34 +0100 > Von: "Fabrizio Carrai" <[EMAIL PROTECTED]> > An: [email protected] > Betreff: [OSM-newbies] R: Speed Limits > What Rally is saying is more than correct for the current level of > navigators. But thinking to an innovative navigator, the John's > information > looks very interesting. > Exact time travel could be estimated using the correct speed limit > available > at the road's usage time. But we could also think to something for > evoluted: > the variation of the speed could be not only function of the time, but > also > of the assesed traffic ondition (statistically or real time assessed). > > I think that having tags supporting the John's data, could add an > interesting support to very advanced applications. > > I'm a recent contibutor to the OSM project, and I would like to use this > thread to learn a bit more on the common idea to be used to add tags (and > to > propose new ones..) to the ways. > >From other threads I understood (please, correct me), that we do not map > for > the application and its capabilities (render, navigator, etc..) but more > for > the completeness of the informations that, indeed, coudl drive any kind of > application. > Looking from a more high point of view is a kind of life-loop: data exists > because there are applications that use them, and applications could > exploit > new features only if the map data are adequately detailed. > > Fabrizio > -----Messaggio originale----- > Da: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] conto di Rally de Leon > Inviato: venerdì 5 dicembre 2008 20.10 > A: [EMAIL PROTECTED]; [email protected] > Oggetto: Re: [OSM-newbies] Speed Limits > > > The most practical use of maxspeed on maps is to estimate the "travel > time" of a particular route in a gps map of a navigational device, rather > than just warn you if you are above the speed limit. > > It's always better to use the conservative value (lower speed limit) to > estimate your travel time (so that the gps device can calculate and show > you > that fastest route without breaking the max speed) > > > On Fri, Dec 5, 2008 at 10:09 PM, John Wesley Simpson <[EMAIL PROTECTED]> > wrote: > > Howdy, > > I'm trying to use maxspeed to put in speed limits for roads in my > local > area. > > One of the roads has a speed limit of 55mph if you are northbound, but > 50mph if you are southbound. > > Another road has a speed limit of 70mph in the daytime, but 65mph at > nighttime. > > How should these be entered? > > Is there a web-page that specifically explains how to enter these > situations into the editor? > > -- > John Wesley Simpson <[EMAIL PROTECTED]> > SwaJime's Cove > > > > _______________________________________________ > newbies mailing list > [email protected] > http://lists.openstreetmap.org/listinfo/newbies > > -- Sensationsangebot verlängert: GMX FreeDSL - Telefonanschluss + DSL für nur 16,37 Euro/mtl.!* http://dsl.gmx.de/?ac=OM.AD.PD003K1308T4569a _______________________________________________ newbies mailing list [email protected] http://lists.openstreetmap.org/listinfo/newbies
