[talk-au] Roundabouts and routing

[Ross Scanlon]

On Fri, 18 Dec 2009 11:26:37 +1000
John Smith <deltafoxtrot256 at gmail.com> wrote:

> 2009/12/18 Ross Scanlon <info at 4x4falcon.com>:
> > Wrong, on everyone of these you have to enter the roundabout and then take the next exit, it is not a graceful sweep.
> 
> We really shouldn't have to map, if they are an exit they're an exit!
> It shouldn't really matter if they are attached to an adjoining entry
> or not. Until this thread came up I wasn't aware this was even an
> issue and have tagged roundabouts this way myself.
> 
> We might be able to do something if it is the pre-processor that is to
> blame for that bad routing information, although if it's a problem
> with garmin software we can't do anything about this other than to
> inform people about the issue and hope they will be understanding that
> even though we shouldn't have to go out of our way to tag a roundabout
> in a special kind of way we do for those that have garmin gear.

Were not tagging it in a special kind of way it's as per the wiki and as per how it is on the ground.

It's also aparent in intersections like this:

http://www.nearmap.com/?ll=-28.085727,153.425859&z=19&t=k
http://www.openstreetmap.org/?lat=-28.085727&lon=153.425859&zoom=18&layers=B000FTF

What's currently entered into osm is not whats on the ground. There are not separate ways going through the center of the intersection but someone has entered them there for the turning lanes.

Josm's validator and turnright throw so many warnings for this intersection it's not funny.

-- 
Ross Scanlon <info at 4x4falcon.com>