A method and apparatus for sorting or pre-sorting objects contains a system of conveyors and crossover diverters incorporating the topology of an omega network. The sorter interconnects a series of perfect shuffle networks, interleaved with banks of crossover switches. Collision avoidance is implemented by controlling flow on accumulator conveyors entering the crossover switches. Extra banks of crossover switches may be added to provide redundancy and load-balancing capabilities to the system.