[Tagging] [Talk-us] Freeway exit tagging

Paul Johnson baloo at ursamundi.org
Fri Aug 26 06:30:51 UTC 2016

On Thu, Aug 25, 2016 at 4:28 PM, Rihards <richlv at nakts.net> wrote:

> On 2016.08.26. 00:15, Jack Burke wrote:
>> Freeway exit tagging
>> I am totally confused.
>> 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
>> Through examples[1], the wiki shows that when the freeway lanes *are*
>> signed, then "through;slight_right" appears to be the correct value.
>> The wiki examples also appear to indicate that "through" is *only*
>> appropriate when there is corresponding signage.  The wiki is also very
> referencing the previous topic in talk-us about how lane tagging should
> follow lane _markings_, i'd like to suggest to only map the legally allowed
> driving directions, no matter how we arrive at them.
> 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 ?
> do we remove those tags during the winter in some regions ?
> mapping of markings separately also seems to have no functional benefit.
> the information should be useful for navigation software - or, more
> importantly, for the end user (no matter which software delivers useful
> service to them). they don't really care how exactly the allowed directions
> are marked, as long as they get through it all without crashes and fines.

This is a pretty nice summary of what I was getting at in the previous
thread on talk-us.  Especially given how common it is to not have the turn
arrows in the first place.  I'm a firm believer that the wiki is wrong on
this one and the ground truth for turn lane tagging should be the actual
application of the lanes, with or without the presence of supporting
signage or pavement markings.
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