[Talk-us] Freeway exit tagging

Duane Gearhart duane at mapzen.com
Mon Aug 29 16:00:08 UTC 2016

FYI - the exit 78 interchange information has been updated. The Mapzen
directions are calling out the exit as you expected

On Fri, Aug 26, 2016 at 12:06 AM, David Mease <meased3 at gmail.com> wrote:

> My interpretation:
> What is the proper method to use turn:lanes to tag freeway lanes
>>> approaching an exit, where the exit branches directly from an edge lane
>>> without being part of the freeway itself, but the freeway lanes are not
>>> signed with an arrow, such as this one?
>>>  http://mapillary.com/map/im/7igAGXSa6EsUYlTIujXchw
> This exit has no turn lane. There is no staging lane prior to the exit
> where tags could be placed, one should not be created just so that there is
> a place to put tags. This freeway should not be split. You said yourself
> that the exit is not part of the freeway itself, so tags should not be
> placed on the freeway. This intersection is a candidate for the destination
> tag.
>> mapping the road markings seems extremely strange - what if they are very
>> faded, when do we map them ? is there a threshold of % of the paint left ?
> what is there are no road markings but there are signs ?
> Same difference. But the arrow in the above example is pointing to where
> the exit is, not describing a turn lane preceding the exit.
>> do we remove those tags during the winter in some regions ?
> Do we remove the name tag from roads when the street signs get iced over
> or overgrown with vegetation?
> mapping of markings separately also seems to have no functional benefit.
>> the information should be useful for navigation
> Road markings are both beneficial and useful for navigation. Cities and
> governments have paid a lot of money installing them all over globe
> precisely for these reasons. OSM would be well served to include them
> exactly as is. I don't hear a lot of people complaining about how those
> arrows on the roads led them astray.
> In the above example, I would not expect navigation software to direct me
> to get into the lane marked with a slight right arrow. In fact, I would be
> miffed when I found there was no such lane. All I would expect is a simple
> "In x distance take exit 78 towards Sycamore/Ocilla"
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