Social distance sign inside an empty London Underground Central line 1992 tube stock train at London Liverpool Street station
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/47739225@N08">citytransportinfo</a>
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/citytransportinfo/50730294358/">1992ts-CovidSignage-P1670083</a>