On Tue, Nov 17, 2009 at 12:13 PM, Peter Miller <peter.mil...@itoworld.com>wrote:
> > Can I suggest we define some terms. > > A Line is all the journeys made using a particular reference (4, X13, > Citi1 etc). Most people actually use the Route relation for this. This > should include all the ways that are travelled on by the vehicle and > all the stops that are called at. It might be helpful to add these > stops in some sort of order (out then back) but it will not always be > possible. > > A Line Variant (also know as a Service Variant) is a unique stopping > pattern for a bunch of Journeys within a Line. (ie inbound, outbound, > inbound via the school, outbound but stopping at the station and not > going to the end of the route etc). This would include all the stops > in order. however..... I strongly suggest we don't add this data to > OSM - it is too complex and not needed for mapping and should be kept > in the schedules service. > > In particular, lets not start using the term Line to describe only a > single direction (ie a variant) or we will get horribly confused. > > I think having the two directions in one relation is a recipe for confusion, because putting "forward_stop" as a role could refer to the direction of the bus service or the semi-arbitrary direction of the way. It's almost bound to be a mess. Whereas it's a lot clearer if the two directions are in separate relations. The only problem with splitting the two directions, as far as I can see, is editor support for having 2 x umpteen relations on a way. Richard
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