[Talk-us] Freeway exit tagging

Jack Burke burkejf3 at gmail.com
Fri Sep 2 20:47:38 UTC 2016

Tagging maxspeed is purely for a router.  So are turn restrictions.

As for turn:lanes meant for complex intersections....the examples in the
wiki show very simple uses.  I can't see anything in it, or the discussion
page, indicating that it is only for complex intersections.  Certainly
there is a lot of talk about how to use it with some complex roads, but
overall it appears to be intended for exactly this type of situation
(namely, indicating lane guidance for exits).


On Fri, Sep 2, 2016 at 1:23 PM, Paul Johnson <baloo at ursamundi.org> wrote:

> On Fri, Sep 2, 2016 at 12:18 PM, David Mease <meased3 at gmail.com> wrote:
>> I thing my reservations about this type of tagging is that this may be
>> "tagging for the router".
> On some level, all of it is.
>> I still view the turn:lanes scheme as a (probably incomplete) way of
>> describing complex intersections. Tagging simple intersections with this
>> scheme just to get a routing engine to display the correct arrow icon is a
>> waste of time.
> A sufficiently smart router could potentially use the info to determine
> whether or not it's plausible to make Y number of lane changes of X
> distance to make a turn and route accordingly.
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