[Tagging] traffic_signals:direction=* vs. direction=*

[Tod Fitch]

> On Mar 22, 2017, at 4:51 PM, yo paseopor <yopaseopor at gmail.com> wrote:
> 
> Anyone else with an opinion ? Two of us might be the very beginning of a
> consensus but we need a little more before even putting a proposal
> page up on the wiki...
> 
> I think to include direction inside the tag with a subkey :forward :backward following the scheme for lanes and so one are the best option instead of using a specific key as direction because we save one key, and we follow a well-known scheme.
> Other thing is the side of the road the traffic sign is , as it changes the form and the style of it (motorway panel vs. little traffic sign on the right side of a road)
> 

“stop:forward=yes” & “stop:backward=yes” seem like they are putting a value in the key as the stuff to the right of the equals may never be anything other than “yes”. On the “lanes:forward” and “lanes:backward” keys at least the values carry variable values.

There is already a “traffic_signals:direction=forward | backward” usage. “stop:direction= forward | backward” and “give_way=forward | backward” would fit that schema too.

> On Mar 22, 2017, at 4:57 PM, Martin Koppenhoefer <dieterdreist at gmail.com> wrote:
> 
> generally it is unsafe to rely on a "direction" like forward or backward as tag on a node. Nodes do not have directions, and there is no relation from a node to a single way, the relation is from a way to a node and many ways can reference the same node, that's not an error. Will it become forbidden to split ways on nodes with stop sign or traffic signal tags, because it breaks the information tagged on those nodes?

Good point. Although one might suggest that it is a theoretical situation as the definition of the stop tag [1] indicates that if on the node connecting multiple then it is a all way stop. And if not on an intersection node then it should be placed at the stop line. [2] I don’t think we are likely to have a stop line in the middle of an intersection. :)

[1] https://wiki.openstreetmap.org/wiki/Tag:highway%3Dstop#All-way_stop
[2] https://wiki.openstreetmap.org/wiki/Tag:highway%3Dstop#Tagging_minor_road_stops


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