[Tagging] Route relations - Forward & Backward

[fly]

Am 05.09.2014 21:00, schrieb Jo:
> Most bus routes in Belgium have several variations. Most have at least
> 2. One from A to B, another from B to A. To me it makes most sense to
> create one route relation for each variation, which contains all the
> stops in the order they will be passed by. Occasionally it happens stops
> occur more than once.

Do not forget that we still have a lot of bus lines mapped with the old
system. On the other hand you would not add a way twice (one forward,
the other backward) but only once without role in the old system.


> Before all the stops (because that is  how JOSM would sort them) come all
> the ways the bus travels along. If a way is used twice, the route
> relation also contains it twice. If all the ways are sorted properly
> there is no need for forward/backward roles. If there is no need for
> something, I prefer to not add it.

Do forward/backward hurt if the way is only used in one direction ?

Some weeks ago I kindly ask another mapper to use forward/backward as
she/he was adding the role "oneway".

There is still lots of work to do in tagging bus lines, especially
regional ones and forward/backward as long as it is used consistently
does not hurt on any type=route.


> Jo
> 
> 
> 2014-09-05 20:40 GMT+02:00 Rob Nickerson <rob.j.nickerson at gmail.com
> <mailto:rob.j.nickerson at gmail.com>>:
> 
>     Dave,
> 
>     My understanding is the same as yours. That is, I map them according
>     to the wiki guidelines:
> 
>     > "Forward" means the route follows this way only in the direction
>     of the way, and "backward" means the route runs only against the
>     direction of the way.
> 
>     Adding these roles to the members that make up the relation allow
>     you to have circular bus routes and know the direction of travel. It
>     also allows you to deal with splits in the road (e.g. a dual
>     carriageway mapped as two separate ways in OSM) or where the "out"
>     and "in" just differ.
> 
>     Having said that, the other mappers method also has all the
>     information in to figure out the route, just not sure if existing
>     tools will cope with that (I actually like including the way twice
>     as this allows you to have all the ways linking in JOSMs relation
>     editor, but not sure if this is frowned upon).
> 
>     Rob