[OSM-talk] Divided roads proposal

Lester Caine lester at lsces.co.uk
Sun Dec 6 11:43:44 GMT 2009


Steve Bennett wrote:
> On Sat, Dec 5, 2009 at 1:43 AM, Anthony <osm at inbox.org 
> <mailto:osm at inbox.org>> wrote:
>  >1, 2. Dual carriageway
> 
>     5, 6, 7, 8, 9, 10. Dual carriageway
> 
> 
> Alright, but let's be practical. It's a lot of effort to create and 
> maintain pairs of roads (let's not call them "dual carriageways" - 
> that's really a specific type of motorway). Let's imagine this tag is 
> implemented and there is renderer support. What value do you see in 
> mapping examples 2 and 10 as pairs of roads rather than a single road 
> with divided=median?
> 
> Is the benefit just so you can get more precise with area micromapping? 
> Let's assume, because it's true, that volunteer mapping time is limited, 
> and the use of areas to micromap roads is rare, and certainly not 
> expected by end users. Why is a pair of roads better in 2 than a single, 
> divided road?

Many of the example pictures have end cases that need to be handled by separated 
roads, so why not just draw the reality on the ground? Having to add MORE 
complexity such as you can turn off this side of the road is just as wrong? So 
map the dual carriage way section, and show the other detail joining to the 
physical situation?

In many areas, the macro level view is complete and people are starting to look 
at the micro view. Just because a few areas 'might look better' in the macro 
view is no reason to remove the existing format, and I see little point adding 
tags for something that is hiding the micro view?

SOME roads do need a 'divider' tag, but only to add 'white line' and other 
'micro' data that can't be included by areas or other means. The crosshatch area 
is just another edge case that needs to be handled in bother levels.

-- 
Lester Caine - G8HFL
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