[OSM-newbies] Traffic lights and crsooings

[David James]

Newbies seems like the correct list for this question ...

In a UK context, how (or more accurately where) should I tag traffic_signals?

Consider a simple traffic-light controlled cross-roads (two roads
intersecting at right-angles, all four approaches to the junction
controlled by traffic lights).

I started off by having a node at the junction and tagging that node with
highway=traffic_signals.

Then I started wondering if I should really be placing a node on each of
the 4 approach ways just before the junction and tagging those nodes with
highway=traffic_signals. That's what is really happening on the ground,
though I'm not convinced I can measure the placement accurately enough.

What really got me thinking about this was when I started wondering about
what to do when the traffic lights incorporate pedestrian lights as well.
Now I need a node on each of the four approaching ways that is tagged as
highway=crossing, and it should be the same node as the one tagged
highway=traffic_signals if putting the traffic_signals on each approaching
way.

What's the standard practice?

-- 
David James