Hi Gerd,
IMO you won't get good routing for cars, if you set all roundabouts to
class 0. My understanding is, that roads with road_class 4 and 3 should
create a proper, continuous network. If you break network at
roundabouts, long distance routing will suffer.
I doubt you will get a nice rendering with all cases. Probably a
roundabout will be still visible below road type 0x06. But if you are
satisfied with rendering, I suggest to use pairs: roundabout with proper
road_class/road_speed and non-routable line in range 0x108xx, these
looks like standard roads: 0x10800 == 0x01, 0x10801 == 0x02 and so on.
--
Best regards,
Andrzej
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