[Tagging] traffic lights

Anthony osm at inbox.org
Sat Sep 3 16:02:02 BST 2011

On Sat, Sep 3, 2011 at 10:42 AM, Nathan Edgars II <neroute2 at gmail.com> wrote:
> On 9/3/2011 10:30 AM, sergio sevillano wrote:
>> El 03/09/2011, a las 12:10, Nathan Edgars II escribió:
>>> On 9/3/2011 6:06 AM, Nathan Edgars II wrote:
>>>> highway=traffic_signals means "this intersection is governed by traffic
>>>> signals".
>>>> If you want a tag for "there is a physical signal here", use a
>>>> different one. Using highway=traffic_signals for this will lose
>>>> important information about what intersections have signals (for
>>>> example, a router can no longer say "turn left at the second signal").
>>> Actually this is a bad example, since there are many reasons for having
>>> more than one traffic_signals node at an intersection. But when turning onto
>>> a trunk from a residential, for example, a router will want to put you out
>>> at a traffic signal, and this is much easier when the intersection node is
>>> clearly labeled.
>> are we mapping reality or "for the router" ?
> Both. Reality is that the intersection is controlled by traffic signals.

The intersection of the roads is not equal to the intersection of the ways.

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