EDIT: since apparently a bunch of people woke up with the wrong foot this morning or forgot to check the group they’re in:
This is a joke. Do not steal or vandalize speed enforcement cameras (or anything else for that matter). That’s against the law and you will likely get arrested.
If you’re addicted to crack or any other drugs, please seek professional help.
If you want to use the definition of a main road being one that goes directly from one town to another that’s fine. In the US that’s called a highway.
No matter what you call it, the larger road that goes near a school is the same in Germany and the US. Both have two way traffic.
Given that it is residential that connects to two other roads, it has through traffic. It would need to be a dead end to not have through traffic. The road isn’t so narrow that busses can’t pass each other. It’s why I linked one school that has a labeled public bus stop.