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

Wed Oct 28 00:00:55 GMT 2009

Hi Mark,

2009/10/27 Mark Burton <markb at ordern.com>:

> misc roundabout related breakage in the GB data). So far, my solution
> in this situation is just to partition one of the "fake flares" so
> that it will no longer trigger a warning.

Yup, mine too.

> Your suggestion to avoid the warning is probably OK - perhaps the
> max distance should be scaled by the distance between the nodes on the
> roundabout i.e. if the flare roads are longer than, say, 5 times the
> distance between the nodes where the flares join the roundabout. That's
> easy to implement and should be correct most of the time.

Another option - possibly a safer one - is to base the max length on
the roundabout diameter, if that's easily deduced. Twice roundabout
diameter would probably be a safe assumption.

> Have you seen any of the roundabout forks/overlaps errors?

I saw a few forks, including one roundabout that was, to put it
politely, buggered. So another nice warning in our armoury. This
particular one would probably have shown up as an overlap too, but I
think I had it fixed by the time overlaps were detected by name. We're
in the happy position in Ireland of (now) having fairly healthy
roundabouts, so with any luck I won't be able to provide much new
feedback :D

Dermot

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