[OSM-talk] [RFC] Deprecating the use of Tag:highway=stop in favour of Key:stop

Lester Caine lester at lsces.co.uk
Mon Aug 24 14:25:22 BST 2009


John Smith wrote:
> --- On Mon, 24/8/09, Roy Wallace <waldo000000 at gmail.com> wrote:
> 
>> The ways must be split so that they end (or begin) at the
>> intersection. (This is required for most of the relation
>> proposals
>> anyway, IIRC.)
>>
>> Then, each way to which a stop sign applies should be
>> tagged with
>> stop=at_last_node (or stop=at_first_node). Seems simple
>> enough.
>>
>> It's a pity that "_last_" and/or "_first" must be
>> specified, but that
>> is the only way you get away with not making a relation -
>> it encodes
>> way and node information in a single tag.
> 
> I liked your suggestion of putting a node just before the intersection and tagging it, making relations and splitting ways sounds like something very convulted just for a stop sign so most people probably won't be bothered.

The exact problem here is that the 'STOP' requirement only relates to
the junction with another road and is therefore not a tag of the way or
the intersection, but rather information relating to approaching one
from the other.

Adding an extra node does make sense, but probably needs a 'relation' to
the intersection as well? In any case the direction through this new
node is the critical piece of information? Tagging ways would require
that every section of a way is broken up. I'm thinking of some route
around here that have several intersections along them, many but not all
of which are compulsory stop along that single way. Simply adding nodes
on the correct side of each intersection would be somewhat easier to
implement, while currently these restrictions are not recorded.

The information is only really needed for routing software, where the
trip time will be affected by HAVING to slow to a stop for each of those
junctions on a route, but in this case, the exact location is not
critical, as in practice one physically stops short of the actual
intersection anyway.

-- 
Lester Caine - G8HFL
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