[Tagging] Understanding links

[johnw]

On Sep 23, 2014, at 7:39 PM, Lukas Sommer <sommerluk at gmail.com> wrote:

> > As I understand it, the local access roads would be an unclassified road with bollards or a kind of barrier at each end, and with trunk links, (or one way unclassified roads?) that lead onto the actual new trunk road.
> 
> There is not much documentation on the wiki. The only thing that I found was a statement at http://wiki.openstreetmap.org/wiki/Tag:highway%3Dservice that says that highway=service is wrong, but everything else is okay.

highway=service & service=alley sounds really good to me - parallel to the main road, narrow, and for local access only - at least in this instance (and a ton of others here)

> 
> I agree that *_link is not good. (Also because you can often use the frontage road with smaller/slower cars than the main road.)

Set it to unclassified currently for my example http://www.openstreetmap.org/edit#map=18/36.34904/139.28130 I quickly mapped out a frontage road along the secondary.
> 
> As frontage roads are quite common in some countries, I think it would be useful to create a wiki page with some documentation and a best practice guide.

I'm surprised to see so many new large roads here in Japan planned with extensive (and narrow, dead-ending near intersections) frontage roads. Every new major road in my area made int he last 2-3 years has them now. they all look similar to the one linked originally and my example. 

+1 

> 
> Proposal for the content:
> 
> – frontage roads are never highway=*_link nor highway=service
> – frontage roads have usually a lower level than the main road (which one is up to the mapper to decide)

if it is not of (severely) lower importance, it isn't a frontage road. 

> 
> Example: If the main road is secondary, the frontage road must be one of “tertiary” or “unclassified” or “residential”.
> 

Tertiary max, if not unclassified max . I mean, a big road often parallels a major way, but this is mostly discussing local access being separated from the faster, adjacent road for traffic management reasons. 
I don't think there are going to be many beyond unclassified, as they are just chopped up little pieces of road just for local access to driveways and alleys.

That might be a good test - if you think it is tertiary, it probably is't a frontage road, as these scream "local access" and nothing more.


> Could this be a useful guide?
> 
> Lukas Sommer


Thanks for all the work.


Javbw
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openstreetmap.org/pipermail/tagging/attachments/20140923/64aa1ec8/attachment.html>