Effect of Interaction among Same-direction Pedestrians

In normal sense, the formation of lanes is caused by the interactions between the different directional pedestrians. While the same directional interactions the interior structure of the lane, is seldom discussed. Here we build a counter flow model with the same directional pedestrians movingunder two different velocities. We found the lanes of same directional pedestrians, including the fast and the slow, overlap each other, and the velocity difference affects the interior structure of the lanes. The lanes of the slow usually locate centrally with narrow width and great aggregation; the lanes of the fast locate peripherally with wide width and slightly aggregation. This is because that the fast need to avoid the same directional slow ones. And thiswill make the fast slowed down by the slow, just like their velocities are infected by the slow ones.