[OSM-talk] Give Way/Yield signs

[Jon Bright]

Hi,

Tapio Sokura wrote:
> 
> But the information could be used behind the scenes for routing 
> purposes, i.e. for junctions without traffic lights where you have to 
> yield, add a little more to the cost than for junctions where you have 
> priority. Especially left turns (in right hand side driving countries) 
> behind a yield sign can be time-consuming.

My plan for routing costing would be to have left-turns by default be 
more expensive in right-side-driving countries.  As such, a marking for 
places where this is not the case would (I think) be more useful for 
routing.  It would, as a happy side effect, solve the problem that lots 
of people who map stuff won't necessarily add every tag.  Absence of a 
"give way" tag would theoretically mean "junction shouldn't be more 
expensive" - whereas in lots of cases it would actually mean "mapper 
didn't add the tag".  Presence of a "no give way even though it normally 
would be judging by the road layout" would give a definitive statement. 
  In Germany, there are signs in many of these cases:

http://www.wdr.de/tv/service/verkehr/inhalt/20020611/bilder/raetsel_2.jpg
http://www.dekra.de/dekra/presse/magazin/pspic/image/74/image1141981652_DI06_03_Ab441141517395f.jpg

...or even this:

http://flickr.com/photos/karakola/583457170/

--
Jon