Re: [OSM-talk] Fwd: Speed in traffic jams/slow traffic
On Fri, 17 Apr 2009 12:32:03 +0200, Yann Coupin y...@coupin.net wrote: Le 17 avr. 09 à 12:07, marcus.wolsc...@googlemail.com marcus.wolsc...@googlemail.com a écrit : What maxspeed could I assume during a traffic-jam of a given length or during reported slow moving traffic? Does anyone have some numbers here? That's for TMC message handling? Isn't there provision for data providers to give a mean speed or do you want to cover the case where There are messages that specify an explicit delay and there are messages that only specify the length of the traffic jam. Here the later are common on the air. Also information about traffic-jams may not only come in via TMC. I'm, trying to keep the architecture open for other plugins that e.g. get such information from web-services or from other cars or from the user. no speed is given. If so, determining the avg. speed is pretty much impossible on a global scale as it's dependent of what the content provider uses for threshold. I remember in Paris an urban highway segment (speed-limit usually 90kph) is considered clogged if the avg. speed falls under 30 kph and it keeps that state until the avg. speed rise above 60 kph. But it is probably different values in some other cities (or on different type of roads where those limits are not adapted). I guess a traffic jam of e.g. 5 kilometers on a lanes=2 highway=motorway will have a similar mean speed everywhere. If not, some gpx/nmea -tracks should be able to disprove this assumption. Does anyone have gps-tracks where he waited through a traffic jam? I don't like to simply assume 0km/h = infinite delay for a traffic jam and like 3 km/h for slow moving traffic. Marcus ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
Re: [OSM-talk] Fwd: Speed in traffic jams/slow traffic
On Fri, 17 Apr 2009 13:02:17 +0200, Sascha Silbe sascha-ml-gis-osm-t...@silbe.org wrote: On Fri, Apr 17, 2009 at 12:43:46PM +0200, marcus.wolsc...@googlemail.com wrote: I don't like to simply assume 0km/h = infinite delay for a traffic jam and like 3 km/h for slow moving traffic. How about using a fraction instead of a fixed value? E.g. 1/4 for slow moving and 1/10 (or even 1/100) for a jam. I don't think waiting 2Km on a motorway is any faster then waiting 2Km on a residential street. As I said, I don't like assuming basically random values what can easily be meassured and modelled. So...everyone with a gps-track through a traffic jam... send it to me. ;) Marcus ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
Re: [OSM-talk] Fwd: Speed in traffic jams/slow traffic
Le 17 avr. 09 à 12:07, marcus.wolsc...@googlemail.com marcus.wolsc...@googlemail.com a écrit : What maxspeed could I assume during a traffic-jam of a given length or during reported slow moving traffic? Does anyone have some numbers here? That's for TMC message handling? Isn't there provision for data providers to give a mean speed or do you want to cover the case where no speed is given. If so, determining the avg. speed is pretty much impossible on a global scale as it's dependent of what the content provider uses for threshold. I remember in Paris an urban highway segment (speed-limit usually 90kph) is considered clogged if the avg. speed falls under 30 kph and it keeps that state until the avg. speed rise above 60 kph. But it is probably different values in some other cities (or on different type of roads where those limits are not adapted). ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
Re: [OSM-talk] Fwd: Speed in traffic jams/slow traffic
On Fri, Apr 17, 2009 at 12:43:46PM +0200, marcus.wolsc...@googlemail.com wrote: I don't like to simply assume 0km/h = infinite delay for a traffic jam and like 3 km/h for slow moving traffic. How about using a fraction instead of a fixed value? E.g. 1/4 for slow moving and 1/10 (or even 1/100) for a jam. CU Sascha -- http://sascha.silbe.org/ http://www.infra-silbe.de/ signature.asc Description: Digital signature ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
