Hello,
I'd like to suggest an idea to map overhead signposts
("Überkopfwegweiser" in German):
Here is a photo of the sign to be mapped:
http://commons.wikimedia.org/wiki/File:A23_Knoten_Kaiserm%C3%BChlen_1.JPG
To map:
Put a node on the way of the street exactly where the sign is located
and tag it something like this:
overhead-sign=|| Brno, Gänserndorf, Stadlau [A23]; | Praha [A23]; / Kagran [B3];
> Ölhafen Lobau
* with the arrows represented by:
| .... up arrow
/ .... slight right arrow
> .... turn right arrow
\ .... slight left arrow
< .... turn left arrow
* the text indicates the text that is written on the sign
(the text should match any destination= tags given on exits)
* refs are given within square brackets [...]
* a semiconlon ; separates the arrows
This gives a router the possibility to show a drawing of
the sign, depending on the direction:
heading Brno:
+-------------------------------+
| Brno,... [A23] |
| ^ ^ ^ / > |
| | | | / / |
+-------------------------------+
heading Praha:
+-------------------------------+
| Praha [A23] |
| ^ ^ ^ / > |
| | | | / / |
+-------------------------------+
heading Kagran:
+-------------------------------+
| Kagran [B3] |
| ^ ^ ^ / > |
| | | | / / |
+-------------------------------+
heading Ölhafen Lobau:
+-------------------------------+
| Ölhafen Lobau|
| ^ ^ ^ / > |
| | | | / / |
+-------------------------------+
(this ASCII art should of course be a drawing with "real"
arrows, nice ref-shields and so on)
Of course this should match the information given in any lane tags,
but it gives the exact position of the sign and it works without
the need of lane tags! That way it should be much easier for
routing app developers to implement hints which lane to use.
For the driver, it's simpler to match the sign given by the app
with the real sign.
/al
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