Acess each information in Firebase database

How do I access every ‘route’ value under d? Every userid can either be a c or d, and I want to access and add all numbers under ‘route’. I don’t know how to access other information because I don’t have other’s UID when logged on to a specific account.

I’ll close this since it looks like you’ve figured out the recommended way to set this up in Firebase which is to have users/[user id]: Why can't I access nested database information?