[Talk-GB] Traffic lights
mike at ayeltd.biz
Mon Sep 15 15:00:11 BST 2008
At 12:52 PM 9/15/2008, Ed Loach wrote:
>Is there any concensus on how to mark traffic lights? I've been
>marking the nodes where two ways join at a light controlled junction
>as traffic_lights, based on where I first saw them used elsewhere,
>but I have since discovered that in some locations some mappers try
>and mark each traffic light post with it's own node (which can make
>a junction look a bit cluttered when rendered).
>I guess technically you are unlikely to get a set of traffic lights
>positioned in the centre of a junction, but in my opinion it is more
>of a property of the junction than an instruction to render lights
>in the centre of the junction.
>Any opinions either way (at the risk of split opinions along the
>lines of bus stops)?
I'm of the school of opinion that places bus stops to the left/right
of the way but for traffic lights I do exactly what you do.
- It is easy to enter and render
- It is easy to extrapolate backwards, i.e. one
highway=traffic_signals on the intersecting node equals one light on
each way coming into the node (even taking into account they may be
one-way). There is no practical need to know which side of the road
the lights are(?). I'd be happy to mark lights individually if I find
a special case, but I haven't yet.
- It is adequate for routing (?), i.e. if a way has a traffic_signals
node on it, add a penalty.
- For routing, if there is a left filter without a light, then I draw
a small connecting way short-cutting the lights node.
Interested to see counter-opinions,
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