  Side preference is a critical behavior in conflict handling, and here the
behavior is investigated with pedestrian trajectories in circle antipode
experiments that own both conflicting and symmetrical participant situations.
In the series of experiments, more participants(around 70\%) prefer to walk on
the right side, and the statistical analyses reveal that factors such as
handedness, gender, and height have no significant impacts. Further
investigations show that most pedestrians actually make the side choices at the
very beginning, and empirical results suggest that selecting the dominate side
preference (right side in our experiments) can benefit the individual movement
efficiency. To reflect the realistic side preference characteristics in
simulations, a Voronoi diagram based model is introduced as well as a side
preference parameter with normal distribution is formulated and calibrated.
Further simulations prove that the modified model is able to reproduce
realistic side preference behaviors in circle antipode experiments and other
common situations.
