3. Preselection maneuvers

In buildings with heavy traffic, battery elevator systems have long been the optimum solution.

For many decades, the vertical division of a building into zones, each served by a battery, was the best compromise between quality of service and number of elevators. In this organization, the elevators in a battery serve all the levels in the battery, and are managed by a logic that uses the following 2 basic principles: each landing call is assigned to the "best-placed" car (basically, the closest car), and the user entering this car can access any level (in the car's direction of travel).

In the 1980s, the advent of microprocessors and microcomputers in elevator equipment enabled the development of different maneuvers.