[Tagging] traffic lights

Bryce Nesbitt bryce2 at obviously.com
Mon Sep 5 02:45:31 BST 2011

On 09/03/2011 07:30 AM, sergio sevillano wrote:
> are we mapping reality or "for the router" ?
The question is at what resolution are we mapping?

First pass, the roads connect.
Second level of detail, the intersection is stoplight controlled.
Next level of detail: it has two left turn lanes.
Next level of detail: it has four stoplight poles.
Next level: the 2nd and 3rd pole have three heads each, two of which 
have left arrow balls and a bicycle phase ball.
After that: a relation to the next signal up for signal synchronization 
with a design speed of 35mph between them.
What's next then? This light is green now with 4 seconds left on the red 
left arrow phase?

Personally I choose to concentrate on blank areas of the map, and 
features that are more stable (the configuration of poles may change 
over time, but the intersection will likely remain stop light controlled 
indefinitely).  osm does not restrict anyone from mapping to any level 
of granularity.

We'd should indeed map to the needs of routers.
But that router-aware mapping can reflect reality at a variety of levels 
of physical and temporal detail.

I'd argue that if you're going to place stoplights at their physical 
location, the/node should still be tagged as a stoplight./

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