An elevator control system employing a micro-processor-based group controller (FIG. 2) which communicates with the cars (3, 4) of the elevator system to determine conditions of the cars and responds to hall calls registered at a plurality of landings in the building serviced by the cars under control of the group controller, to provide assignments of the hall calls to the cars based on the summation for each car, with respect to each call, a weighted summation of a plurality of system response factors, some indicative, and some not, of conditions of the car irrespective of the call to be assigned, assigning "bonuses" and "penalties" to them in the weighted summation. In the invention, rather than a set of unvarying bonuses and penalties being assigned based on the relative system response factors, the assigned bonuses and penalties are varied based on the perceived intensity of traffic, as measured by, for example, a past average waiting time and the elapsed time since registration of the hall call, a selected past five minute average waiting time being exemplary. Exemplary apparatus (FIGS. 1 and 2) and a logic flow diagram (FIG. 3) illustrate a specific manner of assigning calls to cars. Tables set forth exemplary varying bonus and penalty values to be assigned, depending on the ratio of the hall call registration time to the selected average hall call waiting time (Tables 1 and 2) or on their differences (Table 3).