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

When you add up every single navigable road in the US, you get approximately 4 million miles. Out of that, only 47,000 miles (1.2%) are interstate highways. You can see how maintaining this colossal network of city and suburban roads is a big undertaking for local municipalities.

Highways are far more manageable and are usually maintained by state governments.