[OSM-talk] Turn restriction docs

[Nic Roets]

On Sun, Nov 30, 2008 at 3:25 AM, Frederik Ramm <frederik at remote.org> wrote:

> For the record, I am strongly opposed to automated processing of the
> "restriction" ...
>

My guess is that your opposition is based on the fact that some (future)
routing system may not have enough information to calculate angles esp. when
non-junction nodes was removed during prepossessing.

My hope is that someone will start with a clean slate and write a user
friendly visual turn restriction editor. And we will all be so grateful that
these endless discussions have come to an end, that we will all adapt our
software and the DB to whatever he implemented.

But if he splits ways to make restrictions unambigious, then his editor must
warn/prohibit joining those ways. And if he uses tags like
from/to_direction=forwards/backwards, his editor must swap 'forwards' and
'backwards' when the direction of a way with a turn restriction is changed.


> The "restriction" tag would then be used to check whether I can "ONLY" go
> from "from" to "to", or whether I can "NOT" go from "from" to "to". Whatever
> follows after "no_" or "only_" can be


Gosmore currently sees all restrictions as "maneuvers that are disallowed"
and none of them as "maneuvers that are compulsory". Another
misunderstanding.
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