Abstract: .Iadd.An elevator control system for a group of cars in which the control of the cars is transferred in response to traffic conditions from a mode of operation in which the cars are successively started from a terminal in response to the generation of timed dispatching signals to one in which they are started in response to the registration of calls. During the latter mode of operation the cars are distributed throughout that portion of the building they serve whereby one car is parked at the top terminal, one at a landing called the middle free car parking floor and the remainder at the bottom terminal. In these circumstances, the top terminal car serves calls at that landing, the middle free car serves calls at landings between the bottom and top terminals and one of the bottom terminal cars serves calls at that landing and at any basements below it.