[Routing] parsing roundabouts

[OJ W]

On Mon, Mar 2, 2009 at 8:50 AM, Guenther Meyer <d.s.e at sordidmusic.com> wrote:
> Am Montag 02 März 2009 schrieb marcus.wolschon at googlemail.com:
>> Hello everyone.
>>
>> I'm thinking about how to add support for
>> proper driving-instructions for roundabouts
>> to Traveling Salesman.
>> "In 200m enter the roundabout! Then take the second exit!"
>>
>> There are 2 issues:
>>
>> 1 How to determine if the roundabout is drawn clock-wise
>>   or counter-clock-wise.
>
> is this relevant?
> if the routing is implemented properly, the route shouldn't walk into the
> wrong direction (roundabouts are oneway).
> when the route has been calculated, you just count the number of exits from
> entering until leaving, then you have the number of the needed exit.

I presume the issue is mini-roundabouts, which are a node in OSM?