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

Maybe a lot more streets than highways.

In the US there are 47,432 miles of Interstate Highways and 4.09M miles of roadways.