+15 skyway network in <a href="//commons.wikimedia.org/wiki/Calgary" title="Calgary">Calgary</a>, <a href="//commons.wikimedia.org/wiki/Alberta" title="Alberta">Alberta</a>
<a href="//commons.wikimedia.org/wiki/User:Qyd" title="User:Qyd">Qyd</a>
2006-06
Based on <a rel="nofollow" class="external text" href="https://web.archive.org/web/20070203015836/https://www.calgary.ca/docgallery/BU/engineering_services/emaps/plus_15_network_map.pdf">PDF of the Plus 15 system</a>