[OSM-talk-be] Alternate bus routes

[Benoit Leseul]

Hello everyone,

I'm new to this list but I've been doing some mapping in Brussels for
a few months.

Recently, I have been tracking bus stops in my area and found an
interesting case: the bus line 41 from the STIB/MIVB.
Its route happens to be different on weekdays and during the weekend,
due to the closing of the Bois de la Cambre for all vehicle traffic.

On the digital screens outside and inside the bus is written "41 dévié
fermeture bois / 41 omgeleid sluiting bos". There are hard stops (with
shelters and all) on both routes.

So... how should I tag this alternate route and its stops?
a) Make a new relation for the weekend route, tagged with a made-up
line number ("41d" or something) ?
b) Make a new relation only for the part of the route which differs
during the weekend, tagged the same way?
c) Add both routes to the existing relation?

I think b) would render the best on ÖPVN-Karte, but is maybe not so
useful for other tools (a trip planner for example). a) would be more
interesting for other tools but look odd on the map. And c) would be
plain confusing for everyone.

What do you think?

-- 
Benoit