Typical airport security check with a line of people walking throught the metal detector/frame.
<a rel="nofollow" class="external text" href="https://openclipart.org/artist/Juhele">Juhele</a>
2019-01-11
<a rel="nofollow" class="external text" href="https://openclipart.org/detail/313453/airport-security-check">Openclipart</a>