[Tagging] Micro mapping traffic signals

Bryce Nesbitt bryce2 at obviously.com
Wed Aug 28 18:20:12 UTC 2013

On Wed, Aug 28, 2013 at 7:57 AM, Fernando Trebien <
fernando.trebien at gmail.com> wrote:

> However, routing would double count traffic lights in two-way roads
> (as in Kytömaa's counting), though guessing the direction by proximity
> to the intersection should be accurate here in about 99% of the cases,
> as would be for stop signs.

The double (or triple) count of traffic signals is something the routers
need to model anyway.
As has been pointed out, traffic engineering practice is to synchronize
such lights.
Even in places that deliberately mis-time signals to reduce flow,  three
intersection length signals
would be coordinated.

We don't need to tag to the router!  The simple intersection node tagging
is enough for good routing!

(Google or Apple's routers have an advantage here: they don't have to count
signals as they
can count average travel time.)
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