What causes potholes in the streets?

Question:
I've been driving home from my job lately and notice that I've been dodging a few potholes. And I always wonder to myselve how do these potholes exist.

Answers:

What plug in hybrid cars are out?

Water gets under the road. Then it freezes and expands. Then it melts, leaving a hollow spot. Then someone drives over it and caves in the blacktop. Then more people drive over the hole, expanding it further.

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My drivers permit has expired?

to add to the one above, it doesnt help when snow plows chip away at it too (then you get peppered with asphault *shakes fist at ODOT*)

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