[Tagging] Traffic signal warning lights?

[Minh Nguyen]

Vào lúc 01:47 2022-01-13, Tom Pfeifer đã viết:
> On 13.01.2022 09:36, Martin Koppenhoefer wrote:
>>> On 13 Jan 2022, at 00:57, Graeme Fitzpatrick <graemefitz1 at gmail.com> 
>>> wrote:
>>> I'm thinking of highway=traffic_signals + 
>>> traffic_signals=advance_warning.
>>
>>
>> I agree that they aren’t traffic signals in the sense of the 
>> OpenStreetMap tag, that’s why they shouldn’t get the 
>> highway=traffic_signals tag, regardless of additional tags.
> 
> Indeed highway=traffic_signals is unsuitable, since it breaks backward 
> compatibility.
> 
> When a routing engine encounters highway=traffic_signals it calculates 
> an average waiting time,
> and so far it did not have to evaluate sub-tagging for that task.
> 
> Thus a different high-level value is needed for signals that create 
> driver attention but do not influence driving time.

The parallel discussion on the wiki brought up flashing_lights=yes and 
crossing:light=yes. They're slightly orthogonal, but I think both 
examples given so far would be covered by one or the other. (In one of 
the examples, flashing_lights=yes would be tagged on the traffic sign 
node, not the intersection that it warns about.)

https://wiki.openstreetmap.org/wiki/Talk:Tag:highway%3Dtraffic_signals#Traffic_signal_warning_lights

-- 
minh at nguyen.cincinnati.oh.us