ElI5: why is it that we tend to have more pot holes on street roads but not many on freeway or highways?

Question

ElI5: why is it that we tend to have more pot holes on street roads but not many on freeway or highways?

In: Engineering

Answer 1

I71 in my stretch of ohio is straight full of pot holes. If you hit them with so much speed you barely notice, or just avoid those lanes untill after the merge.