Escalator

== **Facts-** **Escalators can move at two speeds- 90 or 120 feet (27 or 37 meters) per minute. Stores generally use the slower speed so that passengers have time to look at the merchandise on each floor. Escalators in airports and subways use the faster speed. Some escalators can carry up to 4,500 people an hour. The movement of the steps can be reversed during rush hours, when most traffic moves in one direction.** **An escalator is a moving stairway that transports passengers up and down the floors of a building. It is generally constructed in areas where elevators would be impractical.** ==

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