<p>Escalators have the capacity to move large numbers of people. They can be placed in the same physical space as a staircase. They have no waiting interval (except during very heavy traffic). They can be used to guide people toward main exits or special exhibits. They may be weatherproofed for outdoor use. A nonfunctional escalator can function as a normal staircase, whereas many other methods of transport become useless when they break down or lose power.
</p>
<dl><dd>Wikipedia</dd></dl>
<a href="//commons.wikimedia.org/wiki/User:Adbh266" title="User:Adbh266">Adbh266</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>