[OSM-talk] Fwd: Speed in traffic jams/slow traffic

[Yann Coupin]

Le 17 avr. 09 à 12:07, <marcus.wolschon at googlemail.com> <marcus.wolschon at 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).