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

Standards. A leading cause of potholes is from water getting under the road. This causes the road to “float”, or the supporting soil to erode. This can almost always be avoided with better planning and implementation. But that could be prohibitively expensive. Sometimes it is more expedient to expect frequent repairs.