[Tagging] maxspeed=* on public transport service routes

[Minh Nguyen]

Vào lúc 06:36 2021-09-12, Michael Tsang đã viết:
> On Monday, 30 August 2021 23:16:17 BST Minh Nguyen 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 is because the train used on the service are designed to run at 225 km/h
> on a railway of 300 km/h. The signposted speed limit is 300 km/h.
> 
>>
>>> 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
> 
> I'm talking about the case where, e.g. the official speed limit for buses is 100
> km/h, but the buses themselves used on the service are fitted with a speed
> limiter at 90 km/h.

OK, so it's about tagging guaranteed attributes of the vehicles that run 
the route. I don't know if there's much precedent for this sort of 
information on route relations, but there's probably no better place for it.

Similarly, one could imagine tagging a subway route with the number of 
subway cars on the trains that service a given route. Perhaps that would 
be useful for capacity analysis or something.

-- 
minh at nguyen.cincinnati.oh.us