Elevated to tunnel on compound curve to corner 2 from right
<a href="//commons.wikimedia.org/wiki/User:Useddenim" title="User:Useddenim">Useddenim</a>
2023-04-22
Own work based on: <a href="//commons.wikimedia.org/wiki/File:BSicon_htkSTR3a.svg" title="File:BSicon htkSTR3a.svg">BSicon htkSTR3a.svg</a>