[Tagging] Micro mapping traffic signals

Pieren pieren3 at gmail.com
Tue Aug 27 21:35:45 UTC 2013

On Tue, Aug 27, 2013 at 11:22 PM, Vincent de Château-Thierry
<vdct at laposte.net> wrote:

> This only deals with single traffic light mapping and will not solve the low
> scale rendering issues (how to put a single icon for multiple traffic
> lights) and the routing through multiple synchronised traffic lights.

It's not similar to the turn restriction relation. We don't need roles
like "from", "to", "via". We just have to represent the controlled
intersection and its traffic lights. The intersection (one or x nodes
of the highways junctions) is a member of the relation with a role
e,g, "intersection" or "junction". The traffic lights individual nodes
are also member of the relation with a role like "traffic_light".
A router is only interested to know if the intersection is controlled
or not; it does not care if it's by one or three traffic lights, or if
it is by two consecutive synchronized traffic lights. For the
renderer, if the relation contains only one member with role
"junction", it can put the icon on this node. If we have more than one
member with this role, it can calculate a centroid of all the
junctions nodes.


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