> On Nov 24, 2015, at 9:20 PM, Martin Koppenhoefer <dieterdre...@gmail.com>
> wrote:
>
> yes, it would eventually create problems in case e.g. a bridge spirals around
> itself (guess improbable case) similar to spiral stairs (maybe these wouldn't
> be called bridges but ramps). It worked for all bridges I have mapped so far
I have been on all these bridges, and walked the walkways mentioned.
- a “loop bridge” it goes around 720 degrees. (two full turns). it is not a
ramp - it is a feature of the trunk road.
https://goo.gl/maps/7U2vg4TBmaG2 <https://goo.gl/maps/7U2vg4TBmaG2>
The rainbow bridge in Tokyo. there is tollway traffic, roadway traffic, a tram,
and two separate walking paths with viewpoints and elevators in the bridge
itself (not the approaches). it’s two layers, unless you count the 2
additional layers for the walkways and elevators in the support towers to
ground level below the road bed level(s).
Speaking of layers & bridges..
- Double decker motorway bridges crossing the Arakawa river in Tokyo
https://goo.gl/maps/64xyvf4LH6k <https://goo.gl/maps/64xyvf4LH6k> (where 6
meets C2 downtown)
- Naruto Bridge
https://goo.gl/maps/K37HDTsATvq <https://goo.gl/maps/K37HDTsATvq>
I know some bridges have road traffic going in different directions on
different levels, but it's considered the same bridge.
This bridge has a full observation deck and view point under the roadway (only
from the west shore to he western tower, not the full distance) for people to
pay to walk out and see the Natural whirlpools that form from the inland sea
tide rush over a submerged ridge (visible in the aerial imagery).
it is the bridge - but there is a whole facility down there *in the bridge*
below the main road bed for pedestrian use, connected to a building onshore
that sells admission to the walkway.
having the man_made=bridge share layers with the roads and sidewalks does work
for all but a handful of bridges (I like that tag) - but assuming the bridge is
a single layer really makes things difficult for large/iconic/odd bridges.
Javbw
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