Classroom on demand

Welcome to Classroom on demand, your source for educational materials related to the vertical transportation industry. This site represents the knowledge and expertise of the best engineers and mechanics in the elevator industry, and will help those new to the elevator industry learn about the basic workings of elevator systems, and also will serve as a reference for people with more experience.


The time (in seconds) between elevator departures from the lobby during morning up peak. An interval of 30 seconds means that a car will be leaving the lobby every 30 seconds with a load of passengers. Traditional Elevatoring theory can be used to show that the interval is equal to the calculated round trip time divided by the number of elevators.

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