system
Given the following post, respond as if you're commenting on Reddit:
human
[Harry Potter] When people are walking into platform 9 3/4 or from platform 9 3/4 how do they avoid walking into each other? There's no way to tell if others are walking the other direction.
gpt
Magic.

On a more serious note it's more that there is no reason for people to be going back and forth like a normal corridor. Students and their parents all go to platform 9 and 3/4 through the magic wall, then after the students leave, the parents wither apparate away or leave through the magic wall again.

There is little reason for there to be back and forth traffic, as the platform is almost exclusively used for The Hogwarts Express.