[Tagging] maxspeed=* on public transport service routes

[stevea]

I have my doubts as to the correctness of adding maxspeed=* to a route relation.  For me, maxspeed=* is only for segments of a roadway (or rail, or maybe other sort of way) where there is a maximally permitted speed by a vehicle traversing upon it.

You might argue that with some "trickery" (well, that's a bit harsh, more like "semantic smearing") you could or should be able to describe an entire route=train (for example) with a single maxspeed=* tag and have it mean something like "maximum permissible speed for any rail transport vehicles upon it."  But not only do I not know of any downstream / user-level / consumer applications that parse OSM data like that (RELATION data, ways are OK for maxspeed=* tags), I do not know of this being so documented anywhere.  So you'd have to do that, maybe in a wiki somewhere, then I might agree, but as I sit and ponder this now, I likely wouldn't.

Please, invent another tag for this.  Or extend maxspeed=*.  But please don't overload maxspeed=* like this, it's far too confusing.

SteveA

> On Aug 30, 2021, at 3:16 PM, Minh Nguyen <minh at nguyen.cincinnati.oh.us> wrote:
> 
> Vào lúc 11:11 2021-08-30, Michael Tsang đã viết:
>> Hi all,
>> I'm trying to add maxspeed=225 onto a type=route_master for a high speed
>> service to specify that the trains running on it only run at most 225 km/h
>> (where the railway itself supports 300 km/h operation and some other trains
>> run at the speed).
> 
> Are these signposted speed limits, physical limitations in the vehicles' capabilities, or scheduling constraints? I've only ever tagged maxspeed on railway ways to represent signposted speed restrictions. [1]
> 
>> This can also be used on any other kind of public transport as well, for
>> example, maxspeed=70 on bus routes where the buses themselves are restricted
>> to 70 km/h even on motorways with maxspeed=110.
> 
> Wouldn't this be an access-dependent speed limit rather than a route-dependent speed limit? maxspeed:bus on a highway way would be more readily consumable than maxspeed on a route or route_master relation.
> 
> [1] https://en.wikipedia.org/wiki/Rail_speed_limits_in_the_United_States
> 
> -- 
> minh at nguyen.cincinnati.oh.us