An elevator system includes an elevator car to travel vertically in a first lane and a second lane; a propulsion system to impart force to the elevator car; a transfer station to move the elevator car horizontally from the first lane to the second lane; and a control system to supervise travel of the elevator car, the control system to supervise a first intersection between the first lane and the transfer station such that no more than one of vertical elevator car travel and horizontal elevator car travel is permitted at the first intersection at a given time.