Abstract: A group controller (17, FIG. 1) for an elevator system servicing a plurality of cars (3, 4) provides next higher demand signals (21, 23, FIG. 4) in addition to higher and lower demand signals (13, 18, FIG. 4), and provides next hall stop commands (8, 11, FIG. 3) in addition to down hall stop and up hall stop commands (11, 17, FIG. 2). The car controller (15, 16, FIG. 1) of each car will determine when its actual committable floor is equal to a floor ahead of the last committable floor it communicated to the group controller (2, FIG. 5) so as to utilize the next demand and next hall stop commands (3-6, FIG. 5) when it actually has advanced beyond the last committable floor for which the group controller has processed command signals for the car, whereby delays in communicating and processing signals between car controllers and a related group controller cannot result in loss of proper group demand and stop commands to the car controller.