[Tagging] direction=forward/backward on nodes ?

[fly]

Please, tell me for what kind of keys is the paragraph about
forward/backward useful. There are no examples and it is only about nodes.

Thanks
fly

Am 12.04.2014 20:00, schrieb John Packer:
> Do note that when used on benches, /forward/ and /backward/ are not
> valid values (which is what we are talking about).
> /amenity=bench/ with a /direction=*/ key use angles and cardinal
> directions as values.
> 
> 
> 2014-04-12 14:46 GMT-03:00 fly <lowflight66 at googlemail.com
> <mailto:lowflight66 at googlemail.com>>:
> 
>     Sorry, forgot the link.
> 
>     Yes, it does make sense and is useful for benches and traffic_signals.
> 
>     Am 12.04.2014 19:43, schrieb John F. Eldredge:
>     > Since a node is a point, and has no dimensions, a direction tag is
>     meaningless.
>     >
>     >
>     > On April 12, 2014 12:20:26 PM CDT, fly <lowflight66 at googlemail.com
>     <mailto:lowflight66 at googlemail.com>> wrote:
>     >> Hey
>     >>
>     >> As I had much fun with the last subject (noexit), I just can not hold
>     >> myself back to jump into another bee nest.
>     >>
>     >> I read on the wiki page [1], that direction=forward/backward are
>     valid
>     >> values also for nodes.
>     >>
>     >> Could someone please explain me, how this can work.
>     >>
>     >> I only find some major reasons not to do that:
>     >> * You always have to look at the parent object to determine the
>     >> direction
>     >> * There is no editor supporting this tag when reverting a way
>     >> direction
>     >> * I am not allowed to split a way at this point which is another
>     >> unneeded burn and once again you need special editor support which is
>     >> not present.
> 
>     [1] https://wiki.openstreetmap.org/wiki/Key:direction