[OSM-talk] Road Widths, Stubs and Priority/Giveway

[Ben Robbins]

>but I suppose we'd need a good guide

I'll stick it on the proposed features later, and try and define them 
acuratly

>>2) Stubs
>>
>>3) Road Status's

2) Stubs...  I'm just using the term used by wikipedia for an 
incomplete/short artical, but we should use it for where a road/path etc is 
known of but not mapped.

http://i57.photobucket.com/albums/g226/ben_robbins_/stubs.png

Here is a cross roads.  I know its a cross roads, but I have only done 2 of 
the roads.  Currectly I have just added 2 arrows as a note to myself and 
others that there are roads waiting to be driving or riden along.

I could attach some notes to the nodes somewhere, but if I told you there 
was a tagged node there you couldn't tell me wich one it was, wich is not 
very helpful.  Therefore i was suggesting josm or other editing softwear 
could have the option to display some symbol at the end of a road, instead 
of an arrow shaped way/segment.  Heres some examples:

http://i57.photobucket.com/albums/g226/ben_robbins_/symbols.png

3) Road Status's

http://i57.photobucket.com/albums/g226/ben_robbins_/junctionexample.png

In that image example C, the road between points 1 and 2 is the main road.  
because of the way the ways are split (as shown in B), a route finder would 
tell you to 'go straight on', then 'go striaght on' when in fact you don't 
need to do anything, but just keep driving.

This is a very simple example, but today I was editing in wales and I found 
a few wierd junctions wich it would make a routefinder give you too much 
unessesery information.

Currently if you look at image A it is inposible to tell wich road joins 
wich road, and wich gives way to wich.

I'm not just saying this for a route finder.  However the data is used, 
there is currently no way of knowing wich road gives way to wich unless the 
roads have different highway status's.

For rendering on a map, a road that gives way to another could fade very 
slightly at the connection point.

One solution I thourght of would just be to tag roads with a status='letter' 
as in example here:

http://i57.photobucket.com/albums/g226/ben_robbins_/junctionexample1.png

The 3 ways down the main road would all have the Tag status=A therefore the 
routefinder or whatever program could see that you are remaining on the same 
road.   It was pointed out in the IRC that if a node only has 2 connecting 
segments it could work out that it doesnt have to tell you anything because 
you must be staying on the same road.

Then Roads B and C have less high status letters so the route finder can 
work out you will be giving way so add some time to the journey.

The flaw with this idea is in example 2 on that same page.  If a road ends 
up givng way to a raod thats lower status than itself, or if its status 
changes.  This is where I am still seeking some solution.

It could be shown on a map by a fading of the road that gives way, for 
example.

Ben

_________________________________________________________________
MSN Hotmail is evolving – check out the new Windows Live Mail 
http://ideas.live.com