<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><br class=""><div><blockquote type="cite" class=""><div class="">On Nov 24, 2015, at 9:20 PM, Martin Koppenhoefer <<a href="mailto:dieterdreist@gmail.com" class="">dieterdreist@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><span style="font-family: Helvetica; font-size: 13px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class="">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</span></div></blockquote></div><div class=""><br class=""></div><div class="">I have been on all these bridges, and walked the walkways mentioned. </div><br class=""><div class="">- a “loop bridge” it goes around 720 degrees. (two full turns). it is not a ramp - it is a feature of the trunk road.</div><div class=""><br class=""></div><div class=""><a href="https://goo.gl/maps/7U2vg4TBmaG2" class="">https://goo.gl/maps/7U2vg4TBmaG2</a></div><div class=""><br class=""></div><div class="">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). </div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">Speaking of layers & bridges..</div><div class=""><br class=""></div><div class="">- Double decker motorway bridges crossing the Arakawa river in Tokyo </div><div class=""><br class=""></div><div class=""><a href="https://goo.gl/maps/64xyvf4LH6k" class="">https://goo.gl/maps/64xyvf4LH6k</a> (where 6 meets C2 downtown)</div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">- Naruto Bridge</div><div class=""><br class=""></div><div class=""><a href="https://goo.gl/maps/K37HDTsATvq" class="">https://goo.gl/maps/K37HDTsATvq</a></div><div class=""><br class=""></div><div class="">I know some bridges have road traffic going in different directions on different levels, but it's considered the same bridge. </div><div class=""><br class=""></div><div class="">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). </div><div class=""><br class=""></div><div class="">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. </div><div class=""><br class=""></div><div class="">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. </div><div class=""><br class=""></div><div class="">Javbw</div></body></html>