Am 11.07.2009 08:23, Marcus Wolschon: > On Fri, Jul 10, 2009 at 5:03 PM, Tobias Knerr<[email protected]> wrote: >> Stanislav Brabec wrote: >>> Is there a way how to map a street with access=destination valid just >>> only for one direction? In the reverse direction it is a standard drive >>> through street. >> Using my proposal >> http://wiki.openstreetmap.org/wiki/Proposed_features/Extended_conditions_for_access_tags >> it would be >> >> access[forward] = destination >> >> (or access:forward = destination, depending on what syntax people like >> better) >> >> Of course that's way direction dependent. > > and it does not work NOW. > Once it MAY be accepted in this OR a modified form (sometime in the future), > then used in a significant number of places (much, much later), > then the first programs may get a feature-request to implement support for it > (where the normal access=destinationis already a bit tricky and not all > programs have internal datastructures that allow such a construct at all) and > quite a while later some developer may find the time to actually implement > and test it. Then people will start filing bugs as it does not work > perfectly the first time and later these bugs may be fixed. > THEN it will be supported in SOME programs while others will still ignore it > completely. > > Whereas drawing 2 ways works now. These 2 ways may even share > exactly the same nodes and if they share the same nodes even turning > around at any of these nodes will work.
I think forcing *everything* to be backward compatible does hinder evolution sometimes. You could also start tagging access:forward and eventually routers *have to* support it because it's used in such big numbers. And, besides, drawing two ways simply does not reflect reality on the ground and as such is a wrong information that cannot be healed later on. It's easier for a router-preprocessor to turn access:forward into two ways internally. Claudius _______________________________________________ talk mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk
