[Tagging] Roundabouts and routing

Martin Koppenhoefer dieterdreist at gmail.com
Fri Sep 9 16:47:24 BST 2011


2011/9/9 Nathan Edgars II <neroute2 at gmail.com>:
> On 9/9/2011 7:14 AM, Martin Koppenhoefer wrote:
>> I also agree with others that those links shouldn't be tagged
>> junction=roundabout. I'd tag the links into the roundabout in the
>> example highway=trunk_link, oneway=yes (and maybe even lanes=1 if
>> applies).
>
> I'd tag them the same as the road they lead to (with an additional
> oneway=yes and necessary changes like halving the lane count). Otherwise you
> end up treating dual carriageways that end at roundabouts differently from
> single carriageways.


it depends. Sometime single carriageway roads going into a roundabout
don't get split. Mostly there is traffic_islands but not in all cases.

cheers,
Martin



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