[Tagging] symmetrical guardrails

John Eldredge john at jfeldredge.com
Sun Jul 12 03:49:59 UTC 2015

That seems reasonable. I was responding to the idea, stated in the original 
definition, that the right side of a guardrail would always be the inner 
side of the guardrail, and the left side would always be outside. In 
practice, guard rails can be present on either, or both, sides of a 
roadway, particularly if it is on a raised embankment.  The side towards 
the traffic will be the inner side. As you said, a guardrail dividing two 
ways may have two "inner" sides if the supports are shared.

John F. Eldredge -- john at jfeldredge.com
"Darkness cannot drive out darkness; only light can do that. Hate cannot 
drive out hate; only love can do that." -- Martin Luther King, Jr.

On July 11, 2015 8:13:01 PM johnw <johnw at mac.com> wrote:

> > On Jul 12, 2015, at 4:41 AM, John Eldredge <john at jfeldredge.com> wrote:
> >
> > Depending upon which side of the road the guardrail is on, either the 
> left side or right side may be inner. If there is a distinct inner and 
> outer side, the inner side will always be towards the traffic.
> >
> >
> Japanese motorway barriers.
> https://goo.gl/maps/7iZrg <https://goo.gl/maps/7iZrg> Countryside
> https://goo.gl/maps/qNir5 <https://goo.gl/maps/qNir5> Urban
> There are some guardrails which share support poles with the one for the 
> opposite road, the total set being about 50-80cm wide.
> If they used separates poles, and had any kind of a gap between them, I 
> could see drawing two ways to represent both guardrails.
> Unless it is very easy to map both sides of the guardrail ( there is a gap) 
> or putting two ways running in opposite directions on the same nodes, (to 
> represent both guardrails), wouldn’t a “both” value of some kind (like for 
> embankment) be reasonable in some instances?
> Javbw
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