Traffic light in the <a href="//commons.wikimedia.org/wiki/M%C3%BCnchen_U-Bahn" title="München U-Bahn">München U-Bahn</a>
<a href="//commons.wikimedia.org/wiki/User:Mattes" title="User:Mattes">User:Mattes</a>
<span class="int-own-work" lang="en">Own work</span>