[mkgmap-dev] [PATCH v5] - drive on left + roundabout direction checking

Tue Oct 27 23:36:17 GMT 2009

I love the roundabout warnings and, with their help, I've been able to
fix all the broken roundabouts in Ireland that they have identified.

In the process, though, I've spotted a particular kind of false
positive that I suspect we can avoid. Consider this way:

http://www.openstreetmap.org/browse/way/43100358

Before I split this way, it went directly from the roundabout west as
N52, connecting in the process to the terriary road to its south
_which itself connects to the roundabout_. Neither road has flares
mapped for it. I got the following warning:

2009/10/27 23:20:25 WARNING (RouteNode): Incoming roundabout flare
road (N52, http://www.openstreetmap.org/browse/way/43100358) points in
wrong direction?
http://www.openstreetmap.org/?lat=53.25524&lon=-7.53688&zoom=17

My interpretation is that, since these roads connect to the roundabout
and then to each other, they must be flare ways. My suggestion is that
there should be a certain reasonable maximum length within which flare
ways are expected to connect together, and that otherwise, they be
considered normal roads.

Dermot

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