The dot-matrix displays are pretty poor. Even when they are showing information they scroll too much and use verbose language. However, as the next picture shows, they most of the time are not  showing travel information.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/73422480@N00">Tom Page</a> from London, UK
CC BY-SA 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/tompagenet/8327086353/">Dotty</a>