Experiment and simulation for counterflow of people going on all fours

Counterflow of students going on all fours is investigated by experiment and simulation. The experiment is performed for the channel with open boundaries. Two types of students going to the right and to the left are taken into account. The video recordings and measurements of individual arrival times are evaluated. The characteristics of counterflow are clarified experimentally. The counterflow of students on all fours is compared with the pedestrian counterflow. The experiment is mimicked by the lattice gas simulation where each student going on all fours is simulated by a biased random walker occupying two sites. The simulation result is compared with the experimental result. It is shown that the experimental result is consistent with the simulation result.