[Tagging] Feature Proposal - RFC - traffic jam warning

[Martin Bober]

jam=yes is not allways impossible to verify. There actually are some 
permanently installed warning signs here in Germany. Although I have to admit 
that most of these signs are temporary (for example due to construction works 
- in which case they might also be valuable for the map) or on demand (on 
motorways - activated by traffic flow sensors).

I think the benefit that this tag would give to the users is worth problems the 
mappers might have verifying. Besides, it would not be the only tag that is 
hard to verify. For example, there is no clear classification of 
highway=primary/secondary/tertiary in the German mapping community. This 
classification depends on the size of the city and other factors.

I gave a rough definition of a traffic jam in the proposal as a giudline for 
verification:
"Generally, a road may be considered jammed if you have to wait for several 
traffic signal periods to cross an intersection or if you need more time to 
travel through the tagged section than a pedestrian would need."

I might add that you have to expect these jams on a daily basis to qualify for 
this tag.


Am Freitag, 28. Mai 2010, 23:53:20 schrieb Roy Wallace:
> On Fri, May 28, 2010 at 8:07 PM, Martin Bober <martin at bdd-music.de> wrote:
> > Hi folks,
> > 
> > I have filled in a proposal for a tag indicating a high risk of traffic
> > jams and would like to hear your comments.
> 
> Nicely put together proposal with examples - good work. BUT jam=yes is
> not verifiable. Anything entered in OSM should be able to be
> demonstrated as correct or incorrect. That an intersection has a "high
> risk of traffic jams" is not verifiable IMHO. For more info:
> http://wiki.openstreetmap.org/wiki/Verifiability
> 
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