30 seconds exposure time using a variable gray filter to crate the light trails along the Neckr´s riverside.
<a href="//commons.wikimedia.org/w/index.php?title=User:Fjermann&amp;action=edit&amp;redlink=1" class="new" title="User:Fjermann (page does not exist)">Fjermann</a>
<span class="int-own-work" lang="en">Own work</span>