[OSM-talk] Crossing ways
david at frankieandshadow.com
Sat Aug 11 16:51:04 BST 2007
On 11/08/2007 15:21, Jon Bright wrote:
> Now that I've found the validation panel in JOSM, I have a question
> about crossing ways.
> I have a dual carriageway, which has a junction with a minor road.
> Traffic on the minor road can join the dual carriageway in either
> direction. Traffic on either part of the dual carriageway can join the
> minor road. Traffic on the dual carriageway cannot perform a U-turn.
> I'd tried to represent this with the ways in the screenshot at
> The validator complains that the selected ways cross one another. There
> are no bridges or tunnels involved here - the whole thing's controlled
> with traffic lights. My question is, what to do in this situation:
> - Should I have organised the junction differently?
> - Should I just ignore the validator's warning?
> - Should I put set one of the ways as layer=1, even though they're not
> really above one another?
> - Something else I didn't think of?
Here's the typical way to do it.
(where x are nodes)
Among numerous examples, see:
Note that Godesdone Road does not have a way through onto the westbound
carriageway: there is a solid reservation there; River Lane and Coldhams
Lane do connect across the reservation. (One could argue that the
highway style for the linking bit of Colhams Lane should be primary, not
secondary I guess).
(Linear) ways should only cross without a node if there is a bridge or
tunnel, and then they should be in separate layers.
How to represent permitted turning movements at a junction is an ongoing
discussion. It needs relationships between ways and/or segments which we
don't have yet. There have been a number of proposals for this;
Frederick is working on something now.
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